Removing noise from build files in git status

[MarcinKasprowicz]

Build files needs to be stored in the repository. Currently each PR in GUI is associated with the necessity of adding or explicitly-no-adding (because of noisy git status) build/ files in to a change. Idea is to separate production build files from development build files.

Production build files should be generated on-demand before each release.
Development build files should be ignored. They should be stored and served from folder build-dev/. The folder will be added to .gitignore.

[gomoripeti]

Fixed by #140