Grunt prompt added + update grunt

Grunt updated to 0.4.2
Grunt prompt  1.0.0 added.
First prompt task added.
Added question for all tasks

New task create-personal: Ask all the necessary questions to create the
personal file.  Settings are used for the other tasks. When the personal
file is created only the passwords will be asked upon running the tasks.
Added prompt questions for build and install. If setting defined in
personal file then question isn't asked.
Updated shell
Added readme for contributing

A special readme with information about how to contribute. And how the
project is set up.
Moved and added extra info to contibute  readme

Moved and added extra info to contibute  readme.
Merge pull request #2 from nvanbaren/Grunt-prompt

Solve issue #1.