Add memory profiling tools

...for troubleshooting memory leak.
Disable test module only on modification.
Refactor profile path to point to ~/.<app_name>

...instead of ~/Library/Application Support/...
Require absolute profile path.
Renate 'syntaxdefs' directory to 'syntax'
Save editor state as YAML in profile.
Fix up YAML representation of editor state.
Fix default profile loading.
Prevent modal popup on unhandled error.
Add command bar
Add "Goto Line" command
Update changelog and prepare for release.
Rename "editors" dir to "state" in profile.
Fix bug in test runner.

Did not pass all command line args to nose.
Fix long pause on quit with many documents open.
Fix startup errors

...due to strange arguments passed by OS X.
Tweak logging on startup.
Improve exception handling.
Fix unknown command processing in command bar.
Major text command refactor.

Text commands are not plain functions with some extra attributes.