Remove Vagrantfile

Vagrantfile was outdated and has nothing to do with running the plugin.
Add .gitattributes and compiled files

Having the compiled files will allow people to download and use the
latest version of the plugin and get it from the 'Download ZIP' button
on the page. Fixes #33
Version change to 0.11-preview
Merge pull request #35 from clusterpy/compiled_plugin

Compiled plugin on master making possible to unzip and use from the Download ZIP button.