Vagrant support

- Finally Vagrant Support!
- Added Vagrantfile in root of TimeOverflow
- Pending to document in Wiki but only following steps are needed after this PR is approved for merge:
- Download Vagrant and VirtualBox
- in root of TimeOverflow do:

$ vagrant up (first time also runs vagrant provision)

After 45 minutes more or less of provisioning do:

$ vagrant ssh
$ cd /vagrant
$ rails s

go to your host and run a browser to connect to http://localhost:3000 :)

NOTE: /vagrant folder inside the image is the same folder as timeoverflow so you can edit from host and changes will be automatically available in the image

git inside the image can be safely used as I have configured git to convert entual CRLF to LF