Remove auto-generated strongloop.css from git

A fixup for fefbb1ea that added a build task to generate strongloop.css
from LESS, but did not remove the generated file from version control.
Merge pull request #553 from strongloop/fix/git-files

Remove auto-generated strongloop.css from git
add better error handling for build and deploy

- add message type to form messages
- show an error if you can't build properly
- handle error during deploy process
- add todo for checking status of deploy
Merge branch 'feature/build-deploy-ui' of github.com:strongloop/strong-studio into feature/build-deploy-ui