SourceMap support for manifest mode
Document manifestOptions parameter
Compatibility fix for older npm versions
Merge branch 'master' into source_maps

* master:
  Keep subdirectory structure when compiling a manifest file
  Add `enable` option to have ability to enable custom configurations
  Test on node 0.10.x
  Provide access to the current Mincer.Environment to helpers

Conflicts:
	Gruntfile.js
	test/mincer_test.js
Perform asset concatenation using SourceNode
Write the map file
Add base url for the source map
Document sourceMappingBaseURL option
Concatenation by source-maps adds empty lines to end of file
Add missing source-map dependency
Test that map has been generated
Update dependencise / expectations for latest source-map
Merge pull request #22 from pirxpilot/source_maps

Implement support for source maps