Adding new feature

Now it's possible to add a description to an alias. That will be passed to Grunt.

For example:

````
default:
  - 'test'
anotherTask:
  description: 'This is an awesome task'
  tasks:
    - 'foo'
    - 'bar'
````

Will then be passed to grunt so running `grunt --help` will show the description.

Fixes #39
Merge pull request #66 from Belelros/feature/39-descriptions-aliases

ability to add description to alias
Release 0.11.0
Adding new feature

When passing `--config-debug` to the `grunt` command, the task will just output the whole object it would pass to grunt.

Fixes #71
Removing else since process would be terminated
support postProcess option to change config before running through grunt
Release 0.12.0
Merge branch 'refs/heads/master' into feature/71-config-debug-flag

Conflicts:
	index.js
Merge pull request #74 from Belelros/feature/71-config-debug-flag

Adding new feature
ability to have multiple targets in config grouping
Release 0.13.0
Fix for aliases to functions
Merge pull request #80 from dfernandez79/master

Alises to functions fail since version 0.11.0
Release 0.13.1