Update ess-mode.el

Updated ess-mode to allow indent and complete
Update ess-custom.el
Update ess-mode.el
Update ess-mode.el
Update ess-custom.el

Took out tab completion option
Update ess-mode.el

No longer check for options
Update ess-mode.el

Changed functions to region-beginning and region-end.  Not sure why I had the other functions.
Merge pull request #41 from mlf176f2/patch-2

Allow TAB to indent code when region is seleceted