Add duration property to XCDYouTubeVideo
Move NS_BLOCK_ASSERTIONS build setting

Move from OTHER_CFLAGS into GCC_PREPROCESSOR_DEFINITIONS where it belongs
Workaround App Store rejection because of PrivateFrameworks

See http://stackoverflow.com/questions/23514579/javascriptcore-framework-availability-on-ios/23514580#23514580 for a full explanation of the problem.
Call MPMoviePlayerViewController designated initializer

Before iOS 8, -[MPMoviePlayerViewController init] was not calling `initWithContentURL:`. On iOS 8, `init` calls `initWithContentURL:` and thus throws and exception if we call [super init] in our subclass.
Add explicit "$(BUILT_PRODUCTS_DIR)/include" header search path

Xcode is really wonky about that
Update CHANGELOG
Set dylib + project version to 2.0.0
Add missing XCDYouTubeKit.h public header in podspec
Update GitHub URL in podspec
Set demo project version to 2.0.0
Update podspec version to 2.0.0
Merge branch 'release/2.0.0' into develop