Added BetterNSLog and JSONPatch pods

#BetterNSLog

A better NSLog implementation. Makes output more meaningful:

    [APPNAME][mt:{0,1}][source_file:line_number][function] DESIRED_OUTPUT

where **mt** stands for Main Thread.
It also includes a debug command, called **DLog**, that doesn't print anything in release mode.

#JSONPatch

Helper class that generates RFC 6902 compliant JSON patches