Preferred dependency was removed in GData podspec
GData podspec was updated to support XMLNode as a subspec
Updated svn podspecs.
GData/Youtube : Source path bug fix
Removed GData 2 spec, because of a non authoritative version.
Updated GData specs with better license informations.
Modified the licenses for GData and LOG_EXPR pods.
Added a first version of the GData pod spec file. Only YouTube is ava…
…ilable as a subspec.