Integrates Yoga's sources into FlexLayout

That was not my first choice, but Yoga's repository is diverging from our iOS needs.

Reasons:

• Yoga is now C++ and not C anymore. This was causing issues when built into frameworks.

• FlexLayout Carthage support was not really great using Yoga's repository. The previous solution was already using a fork of Yoga's repo, but there was some issues while deploying app to the App store (embedding frameworks).

  • Added by Luc Dion in Pull Request #61

Add margins methods taking percentage parameters

Add margins methods taking percentage parameters:

• marginTop(_ percent: FPercent)
  Top margin specify the offset the top edge of the item should have from it’s closest sibling (item) or parent (container).
• marginLeft(_ percent: FPercent)
  Left margin specify the offset the left edge of the item should have from it’s closest sibling (item) or parent (container).
• marginBottom(_ percent: FPercent)
  Bottom margin specify the offset the bottom edge of the item should have from it’s closest sibling (item) or parent (container)
• marginRight(_ percent: FPercent)
  Right margin specify the offset the right edge of the item should have from it’s closest sibling (item) or parent (container).
• marginStart(_ percent: FPercent)
  Set the start margin. In LTR direction, start margin specify the left margin. In RTL direction, start margin specify the right margin.
• marginEnd(_ percent: FPercent)
  Set the end margin. In LTR direction, end margin specify the right margin. In RTL direction, end margin specify the left margin.
• marginHorizontal(_ percent: FPercent)
  Set the left, right, start and end margins to the specified value.
• marginVertical(_ percent: FPercent)
  Set the top and bottom margins to the specified value.

Usage examples:

  view.flex.margin(20%)
  view.flex.marginTop(20%).marginLeft(20%)
  view.flex.marginHorizontal(10%)

Update Carthage support

1.2.1

Update version to 1.2.1

Many properties can now be reset to their initial state

• Many properties can be reset to their initial state. Specifying nil when calling these properties reset their value:

  • width(nil)
  • height(nil)
  • size(nil)
  • minWidth(nil)
  • maxWidth(nil)
  • minHeight(nil)
  • maxHeight(nil)
  • aspectRatio(nil)

• FlexLayout now integrates YogaKit source code, this was needed to improve efficiently the iOS's yoga interface.

• Added by Luc Dion in Pull Request #40

AspectRatio can now be reset

AspectRatio can now be reset.
Simply call aspectRatio(nil).

New margin and padding methods, UICollectionView example, iPhone X examples support

• Add new margin methods:

  • margin(_ insets: UIEdgeInsets): Set all margins using UIEdgeInsets.
    This method is particularly useful to set all margins using iOS 11 UIView.safeAreaInsets
  • margin(_ directionalInsets: NSDirectionalEdgeInsets): Set margins using NSDirectionalEdgeInsets.
    This method is particularly to set all margins using iOS 11 UIView.directionalLayoutMargins

• Add new padding methods:

  • padding(_ insets: UIEdgeInsets): Set all paddings using UIEdgeInsets.
    This method is particularly useful using iOS 11 UIView.safeAreaInsets
  • padding(_ directionalInsets: NSDirectionalEdgeInsets): Set paddings using NSDirectionalEdgeInsets.
    This method is particularly useful to set all paddings using iOS 11 UIView.directionalLayoutMargins

• Update all examples to support iPhone X landscape orientation.

• Add an example of UICollectionView using FlexLayout

width/height methods taking percentage parameter

Add width/height methods taking percentage parameter
* width(_ percent: FPercent)
* height(_ percent: FPercent)
* minWidth(_ percent: FPercent)
* maxWidth(_ percent: FPercent)
* minHeight(_ percent: FPercent)
* maxHeight(_ percent: FPercent)

Usage examples:

* view.flex.width(50%)
* view.flex.height(25%)

* Added by [Luc Dion](https://github.com/lucdion) in Pull Request [#28](https://github.com/lucdion/FlexLayout/pull/28) 

Add Carthage support

Add Carthage support

• Added by Luc Dion in Pull Request #25

Improved the Align enumeration

Replace the unique Align enumeration by 3 enumerations:

• AlignContent
• AlignItems
• AlignSelf

They all have different options, which make the API cleaner.

Plus:

• Removed the overflow() method for now.

addContainer() renamed addItem(), markDirty()

• Add missing markDirty() method
• ⚠️ BREAKING CHANGE: Renamed the method addContainer() to `addItem(). It is clearer that the added view is in fact a flex item, and not just a flex container.
  • Added by Luc Dion in Pull Request #8
• Add an implementation of the Ray Wenderlich Yoga Tutorial
  • Added by Luc Dion in Pull Request #7
• Add Swift 4.0 support