Added support for index creation

Signed-off-by: Rodolfo Cartas <rodolfo@blimp.mx>
Merge branch 'master' of https://github.com/Rodolfocartas/sugar

Signed-off-by: Rodolfo Cartas <rodolfo@blimp.mx>

Conflicts:
	library/src/com/orm/SugarDb.java