Add an option for a banner

A banner is a string prepended to the specified output file.

Closes #45.
Closes #62.
Merge pull request #62 from drublic/banner

PR: Add an option for a banner (#45)
0.5.0
Update changelog, readme, etc
Mention that `banner` isn't compatible with `sourcemap`
Log successful file creation.
Merge pull request #64 from MayhemYDG/patch-1

Log successful file creation.
Fixing bundle exec 404
remove deprecated grunt util
0.5.1
write options not needed anymore
Ignore "_" partial files

This matches the expected behaviour in Ruby globbing

Fixes gh-72
Merge pull request #80 from nschonni/ignore-partials

Ignore "_" partial files
0.6.0
changelog
Colorize created path as cyan (using chalk)
Merge pull request #81 from radkodinev/colorize-created-path

Colorize created path as cyan (using chalk)
update file in the right place

sorry!
Merge pull request #87 from jtmkrueger/patch-2

update file in the right place
Fix spawning on Windows