Added pod spec and updated swift version to 3

.swift-version

@@ -0,0 +1 @@
+3.0

CardsStack.podspec

@@ -0,0 +1,14 @@
+Pod::Spec.new do |spec|
+  spec.name = "CardsStack"
+  spec.version = "0.2.1"
+  spec.summary = "UICollectionView turned to awesome set of cards"
+  spec.homepage = "https://github.com/priteshrnandgaonkar/CardsStack"
+  spec.license = { type: 'MIT', file: 'LICENSE.md' }
+  spec.authors = { "Pritesh Nandgaonkar" => '[email protected]' }
+  spec.social_media_url = "https://twitter.com/prit91"
+
+  spec.platform = :ios, "8.0"
+  spec.requires_arc = true
+  spec.source = { git: "https://github.com/priteshrnandgaonkar/CardsStack.git", tag: "0.2.1", submodules: true }
+  spec.source_files = "CardsStack/**/*.{h,swift}"
+end

CardsStack.xcodeproj/project.pbxproj

@@ -281,6 +281,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -326,6 +327,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";

Example/CardsStackExample.xcodeproj/project.pbxproj

@@ -459,6 +459,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -501,6 +502,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 			};