Correct pod version

• Fixed incorrect pod version in podspec

Singleton and debugmode

• Does not automatically set the SharedClient singleton. Needs to be explicit set. [streeter]
• Set RavenClient in debug mode by not configuring a dsn. [kaylarose]
• Added iOS Framework target [fjolnir]
• Fixed conversion warning [pavel-zdenek]

0.2.0

• Enable ARC in RavenJSONUtilities. [Sam Gross]
• Removed unneeded reference to -fno-objc-arc [Greg Krsak]
• The project works on OS X, edited podspec and README. Updated to new "recommended project settings". Use automatic @synthesize. Properly init the RavenConfig object. [Kevin Renskers]