avoid header naming collisions with Base64Transcoder.h

This change avoids header name collisions when a project contains another file
named Base64Transcoder.h (e.g., OAuthConsumer).
Merge pull request #174 from lionheart/master

avoid header naming collisions with Base64Transcoder.h
Fix iOS 7 crash related to non-predefined custom field values
Fixing an IOS7 crash that occurs upon exiting the suggestion list view controller after scrolling.
Fix for load order issue that would result in a 401 on the first try if you passed a user but not a key pair
Bump to 2.0.14
Merge pull request #189 from mikelow/master

Fix for IOS7 non-nilled delegate crasher
Load forum after user in case forum is private and user has credentials
Pass uvts with ticket so that we can wire up traits
Bump to 2.0.15
Merge tag '2.0.15' of git://github.com/uservoice/uservoice-iphone-sdk