fixed bug introduced into builtin_trap due to 'quit' being removed twice - test suit now passes

docstring fix in CloseEvent to conform to standards

A minimal fix for issue 185 (GTK)

Merge branch 'logo-fix' of http://github.com/eteq/ipython into trunk

qtconsole with pure python kernel now properly catches the SystemExit exception, allowing python exit() function to work correctly

moved Quitter to deathrow as it is no longer used by anything

__builtin__.exit and quit are now hidden - exit magic is now the only exit command

Fix bug in tab completion of filenames when quotes are present. Unit tests added to the completion code as well, to validate quote handling more stringently.

Expanded %exit magic in qtconsole to not exit without prompting and added -k option to keep kernel running.

Add context manager for temporary directories from Python 3.2 This is very useful in tests, and after writing my own version I found out that python 3.2 has now a basically identical implementation to mine, so I copied that instead. We can remove our copy once we're not supporting python 2.x anymore.