Gitignore file added.
Added a new MVAttachment class.

MVAttachment is a model class for wrapping attachments.
Modified the MVComment class to make it compatible for the new API version.
Fixed a mistake in the documentation of the MVComment class.
Created a new MVLike class to wrap likes into objects.

MVLike is a new model class.
Tweaked the README.
Updated the README.
Modified the README and added a AuthBrowser class.
Made the API compatible to the new API version.