Stash Dialog Enhancements

- Display stash message instead of stash name (stash@x) in the stash combo
- Fix stash combo resize to work
Enhance Form popups to Close on Escape key press
Add a commit dialog setting to filter the previous commit messages by the current user (--author:[user.name])
Add merge button to the commit dialog
Add app setting for stash dialog to control what the selected stash on form load
Added app setting for displaying pull button on commit dialog
Changed Stash drop down to be a dropdownlist
Replace stash dialog buttons with toolstrip buttons
Replace stash drop down with a tree