Coffeescript added, added initialization by string

Coffescript file inside folder ./coffee
To initialize releaser by string ( like "0.1.4" ), just do

<code language="javascript">versionNumber = new releaser(version:"0.1.4").number</code>

Also please change back package.json. I've needed to install it by npm, so I've published it. I will not be able to delete it, but I can give it to you inside npm. Thanks!