We'll pull-in boost, glm, and UriParser via CocoaPods. As such:
- remove the git submodule for UriParser
- remove the boost and glm folders
Create a .podspec file for VideoCore. This obviates the need for:
- a git submodule for UriParser
- inclusion of the boost source in lib/include
- inclusion of the glm source in lib/include

**IMPORTANT**: See the notes in sample/SampleBroadcaster/Podfile for final work do do after this merge.
Merge pull request #13 from cine-io/use-cocoapods

Use CocoaPods rather than git submodules and dumping stuff in lib/include.