Delete ignored files

[abhisekp]

Untrack and delete unwanted or auto-generated files from repo which are ignored using .gitignore files.

[abhisekp]

In ref. to #163 (comment)

Deletion worked using the following command

git ls-files --ignored --exclude-standard | tr '\n' '\0' | xargs -0 -n255 git rm

Reference: http://stackoverflow.com/a/28806991/1262108