Updating To Go 1.8, using stdlib Context

Merge pull request #38 from bsdlp/chore/update-goji-dependencies

updates dependencies for goji

0.10.1: Merge pull request #37 from bsdlp/merge_goji_logger

Merge's https://github.com/derekdowling/goji2-logger into go-json-spec-handler

JSHAPI submodule of jsh

This makes a lot of things simpler including managing cyclical dependencies and ensuring that JSHAPI, which is dependent on JSH to always be in sync with it.

Go 1.6 Compatibility

Uses /vendor directly rather than godeps.

JSH Document Modes

In order to better conform with specification requirements we've introduced the idea of Document Modes. See #22 for the implementation and 92355c86a2340ed5954b80a25d0fee469c607b41for the full explanation of their usage.

Enhanced ErrorType

Better validation error messages, adds ability to check a status code without needing to type check.

Default/Empty Data Attribute Improvements

Thanks to @petercgrant for the improvement around handling empty data attributes within JSH. This aspect should now be synchronized with JSONAPI.

Include Validations Fixed

Thanks to @samikoskinen for the good catch on Included validations, that should now be working as expected.

1 -> Many Relationships

Thanks to @jkongie we now have JSONAPI compliance with relationships for 1-to-1 and 1-to-many!

Adding Client Request Builders for Fetch/List.

Should have been done a long time ago in a galaxy far far away. Adds the benefit of being able to modify the request, and also goes through standardized jsh.Do for response building.