Prevent crash if config has been garbage collected.
Make Article implement Parcelable
Prevent crash in ArticleActivity if Session is GCd
Merge branch 'configcrash' of git://github.com/DDRBoxman/uservoice-android-sdk into DDRBoxman-configcrash

Conflicts:
	UserVoiceSDK/src/com/uservoice/uservoicesdk/model/Article.java
	UserVoiceSDK/src/com/uservoice/uservoicesdk/model/ClientConfig.java
Merge branch 'DDRBoxman-configcrash'