Adding support for rvm to the emacs shell.

* Before invoking an M-x shell, do an M-x rvm and change the version
  to whatever version you want. THEN invoke the shell. RVM should just
  work.
Merge branch 'master' of git://github.com/mravery/emacsconfig
[emacs][git] web-mode config change, git log alias change.

* Setting web-mode indent to 4 spaces.
* Adding log aliases for git.
[git] Adding --decorate to display particular branch.