The big AudioSession EventHandler of T migration to Action of T of 2013
btouch: support passing -sdk to the compiler; -sdk:4 for MonoMac

Set the compiler back to 'mcs' for MonoMac (used to be
'gmcs') and set the default SDK for MonoMac to be 4.

Do not pass a default SDK for MonoTouch for now (no
behavior change, continues to use the 'smcs' wrapper
by default).
Modify CGImageProperties to return float value for DPIHeight and DPIWidth instead of integer.
Mark the DPIWidth and DPIHeight integer properties as Obsolete instead of removing them.
NSBundle: add PathsForResources methods
Merge pull request #57 from kjpou1/master

Modify CGImageProperties to return float value for DPIHeight and DPIWidt...
Further mcs 3.2.3 compilation fixes
More mcs 3.2.3 compilation fixes
Fixes compilation with 3.2.3 mcs