Update debug module.
Bump to new version
Skip duplicate configurations.

This should resolve #289.

This also detects a bad configuration where multiple blocks attempt to write
to the same destination with different sources.
Update file.js

Fixed conditional regexp to handle cases like <!--[...]><!-->
Merge pull request #383 from ppavell/master

Fix for Conditional Comments Mangling #263
Updating regex to fix conditional mangling

fixes #263 ??

Slight edit to regex so that comments can still be on same line
Merge pull request #384 from zeppocreative/master

Updating regex to fix conditional mangling
add suport for block replacement for custom block types
Update dependencies.
remove self-closing in link tags
fix linebreaks in README.md
Merge pull request #337 from mcampo/custom-types

add suport for block replacement for custom block types
Merge pull request #382 from boushley/skip-duplicates-289

Skip duplicate configurations.
2.3.0
Update README.md
Merge github.com:yeoman/grunt-usemin

* github.com:yeoman/grunt-usemin:
  Update README.md
  2.3.0
  remove self-closing in link tags fix linebreaks in README.md
  Update dependencies.
  add suport for block replacement for custom block types
  Updating regex to fix conditional mangling
  Update file.js
  Skip duplicate configurations.
  Bump to new version
  Update debug module.