Add SwiftGif framework target

- Rename SwiftGif -> SwiftGifDemo

Merge branch '1.5.3-development'

* 1.5.3-development:
  Bump podspec version
  Fix `var` parameter deprecation warning
  Fix Missing Framework warning

Merge branch '1.5.2-development'

* 1.5.2-development:
  Format code, bump version
  add  gifWithURL
  support tvos

Merge branch '1.5.1-development'

* 1.5.1-development:
  Update LICENSE
  Fix podspec version

Merge branch '1.5-development'

* 1.5-development:
  Update to recommended settings
  Add badges
  Better markup in README.md
  added public statements
  Update README.md
  Update RootViewController.swift
  Update UIImage+Gif.swift
  Add build status badge
  Update .travis.yml
  Added swift2 update check message tracker

Merge branch '1.4.2-development'

* 1.4.2-development:
  Rename pod to SwiftGifOrigin

Merge branch '1.4.1-development'

* 1.4.1-development:
  Update version in podspec, fix swiftgif#5 and swiftgif#9
  marked some methods as public
  added a CocoaPods podspec file

Merge pull request swiftgif#8 from mackuba/swift20

Fixes for Xcode 7 & Swift 2

Merge pull request swiftgif#4 from JoelSimonoff/master

Fixed UIImage+Gif.swift and RootViewController.swift

Merge branch '1.3-development'

* 1.3-development:
  Remove .xcuserstate and ignore it
  Update README.md
  Make tests pass
  Add compatibilty for Xcode 6.3
  Fix bundle selection for test image loading

Conflicts:
	SwiftGifTests/GifTests.swift