Fix several invalid property values for a valid css3.
Update bootstrap submodule.
Merge branch 'master' of https://github.com/morteza/bootstrap-rtl

# By niccottrell
# Via Morteza Ansarinia (1) and niccottrell (1)
* 'master' of https://github.com/morteza/bootstrap-rtl:
  Update list-group-rtl.less