Merge pull request #17 from klikh/master

Include files which we don't want to share to .gitignore
Merge pull request #18 from klikh/master

Make the run configuration singleton
added workaround for multi-rooted repository
there is no need of vcs roots in CrucibleSession
add general comment action added
dispose comment balloon after success
improved UI #5
added billet for "Add comment to file action"
added test data
added repository location hash for git repo
added review item concept so fixed #16
updated plugin zip
cleanup
do not substitute all other changes browsers
make Open repository version action work
updated plugin zip
clear selection in review table
add button for "add comment action"
adjusted column widths so fixed #5
fixed broken add comment action from context menu
added add comment for file action so fixed #3