Update for compatibility with grunt 0.4.0rc5

[cowboy]

I need someone to help update this plugin to work with grunt 0.4.0rc5.

I had to revert the whole file src-dest mappings implicit iteration abstraction per gruntjs/grunt#606, and once again, multi tasks have to iterate over this.files manually. In addition, there's a new this.filesSrc array that contains a reduced, uniqued set of all matched src files in case the task is read-only and only cares about source files.

See:

• this comment for a description of the changes made.
• grunt-contrib-jshint for an example using the this.filesSrc array.
• grunt-contrib-concat for an example using the this.files array.

Notes:

• A user may specify a new option nonull in addition to src to tell grunt to keep patterns or filepaths that don't actually match files. Because of this, the task shouldn't explode if a nonexistent src filepath is encountered. I handle this in the grunt-contrib-concat by warning if not grunt.file.exists but not failing the task.

Guidelines for updating / publishing this plugin:

• Change this project's version number to one ending in "rc5" so that it's clearer that it works with grunt 0.4.0rc5. If the existing version number doesn't end in an "a" or "rc" increment the patch version. Eg, jshint went from 0.1.0 -> 0.1.1rc5
• Ensure grunt 0.4.0rc5-compatible plugins are specified in package.json devDependencies like this (grunt-contrib-internal can be "*")
• Update the CHANGELOG like this
• Regenerate the README.md file via grunt.
• Delete node_modules, run npm cache clean and re-run npm install to test.
• Publish to npm using --tag=master (not latest)

[shama]

Done on 58be8df. Just needs a publish.

[mattd]

+1 on the publish. :)

[tkellen]

0.5.0rc7 is on npm now. The 'wrapped' option is now defaulted to true, which matches the handlebars binary. Thanks a million for the cleanup on this Shama!