Add command histories

- Add option to save command histories.
- Keep command histories when Run Command Action was run.
Fix max command size
Add RunCommandHistoryTest
Add test case for RunCommandHistoryTest
Merge pull request #31 from junichi11/command-histories

Add command histories
Add StatusLine
Add provider option

- Specify the provider name when up command is run on the Vagrant Status Window
Merge pull request #32 from junichi11/improve-status-view

Improve status view
Fix action when NB is close #33

- Do nothing if none is set to project properties
Remove a comment
Fix vagrantboxes list #35
Fix init command #34
Show confirmation dialog before destroy command is run
add puppet project type
Merge pull request #38 from mkleint/dev

Add puppet project type
Update version number to 0.6.3
Merge branch 'dev'