More formatting improvements, added mainpage

mainpage.dox

@@ -0,0 +1,29 @@
+/**
+* @mainpage Dent
+* 
+* The Hitchhikers Team 2015 robot, Dent. Features an elevator, bin elevator, and mecanum drive
+* @section Subsystems
+*   -# @ref Drivetrain
+*   -# @ref BinElevator
+*   -# @ref Elevator
+*   -# @ref Collector
+*   -# @ref Pneumatics (unused)
+* @section Commands
+*   -# @ref AutoDrive
+*   -# @ref Turn
+*   -# @ref BinCloseArms
+*   -# @ref BinLower
+*   -# @ref BinOpenArms
+*   -# @ref BinRaise
+*   -# @ref RollIn
+*   -# @ref RollOut
+*   -# @ref Drive
+*   -# @ref Lower
+*   -# @ref Raise
+* @section Command Groups
+*   -# @ref Autonomous
+*   -# @ref CollectTote
+*   -# @ref ReleaseTote
+*   -# @ref CheckDrive
+*   -# @ref CheckRobot
+*/