Only delete a file if it could be found
Merge pull request #38 from joscha/patch-1

Only delete existent files
0.3.4
Gruntless tests.
Code coverage and excluding node 0.11 for the moment.
Ignoring extra files.
Async layout with massive refactoring and code coverage.
v1.0.0 changelog
npm 1.4.6 and no grunt-cli needed for tests