Added support for Travis CI
Added Travis CI build status image to README
Updated Travis CI image to only show master branch
Added Utils to automatic REPL imports
Added documentation and examples

Squashed commit of the following:

commit a0762b13d969ac71d3cdd747e326e92d9934dc71
Author: Anish Athalye <aathalye@me.com>
Date:   Thu Jul 18 17:14:18 2013 -0400

    Added documentation for Ast and DSL

commit d73331832065f6d37c2c0f1bc67aa2909881e39e
Author: Anish Athalye <aathalye@me.com>
Date:   Thu Jul 18 10:22:16 2013 -0400

    Made Utils a value class

    Making Utils a value class increases efficiency.

commit 56fd7332ea9bab1b5770ecdaed44846a947ce1c4
Author: Anish Athalye <aathalye@me.com>
Date:   Wed Jul 17 14:47:33 2013 -0400

    Updated Ast documentation

commit bc6407b2d6cce251e3df4ea51415c404663a3082
Author: Anish Athalye <aathalye@me.com>
Date:   Wed Jul 17 11:58:26 2013 -0400

    Renamed BaseExtractor.scala to Extractor.scala

commit 01578876d3d0c743b017363209eb277447761ce8
Author: Anish Athalye <aathalye@me.com>
Date:   Wed Jul 17 11:23:28 2013 -0400

    Added documentation to Extractor

commit d4538431340aa5916197a0cd6576d89634ce582c
Author: Anish Athalye <aathalye@me.com>
Date:   Wed Jul 17 11:08:54 2013 -0400

    Added documentation to parsers

commit fa5495cd8f724e746de9292ef709ef9d40e04b49
Author: Anish Athalye <aathalye@me.com>
Date:   Wed Jul 17 10:24:19 2013 -0400

    Added documentation to Utils