Added SBT plugins

Squashed commit of the following:

commit 3908d451aa7bdeb57d9cddcee4641ed7eaf7d5f7
Author: Anish Athalye <aathalye@me.com>
Date:   Thu Jul 18 21:55:18 2013 -0400

    Added SBT Scalastyle plugin

commit 57f6737b531fe4094d9fb601763ea76d36870d56
Author: Anish Athalye <aathalye@me.com>
Date:   Thu Jul 18 21:38:42 2013 -0400

    Added .gitignore for SBT

commit 8cd9a67ba57075cb4206f4c8e2d5b1bec2d51533
Author: Anish Athalye <aathalye@me.com>
Date:   Thu Jul 18 21:38:31 2013 -0400

    Added SBT Scalariform plugin

commit e359faac1cef43b8fbb45eae3b6ce975ac0fbac6
Author: Anish Athalye <aathalye@me.com>
Date:   Thu Jul 18 20:08:38 2013 -0400

    Added SBT eclipse plugin