Basic PDLog functionality. Need to fix up interface, and add more variables.
Re-organizing classes/categories.

Making PDLog/PDLogObjects. Re-working property descriptor calculation, fixing Twitter Test app.
Removing Array/Dictionary containers in favour of categories on NSArray/Set/Dictionary
Making invalid valueForKey properties more obvious.
Severity.
Merge from upstream.
Move _PDArrayIndex/_PDSetIndex out to PDContainerIndex. Fix PDLogObjects.
Releasing objects when console is cleared.
Update comments.
Typo
Clear remote objects properly.
Merge pull request #46 from wlue/remote-logging

Remote Logging and Object Inspection