Fixes issue #38

This changeset implements postfix comments "///<" for most elements:

 * @property
 * -/+ method declaration
 * -/+ method definition
 * NS_ENUM/NS_OPTION typedef
 * NE_ENUM/NS_OPTION keys

Multi line postfix comments are supported within above elements.

Postfix comments are ignored for classes, interfaces, protocols, etc.

If both, a normal (prefix) and a postfix comment is available, the postfix
comment is ignored.
Added typedef block parsing
Added cross referencing for top-level defined blocks
Implement simple cross referencing within method outputs
Fixed compiler warnings about missing [super dealloc]s
Fixed possible bug for constants in stringByConvertingSimpleCrossReferencesInString: cross reference prevention
Fixed compiling with latest xcode
Merge pull request #459 from dhoepfl/postfix

Fix for issue #38: Allow single-line comment *after* the documented line
Merge pull request #462 from DerFlash/blocks

Added typedef block parsing