Adding rbenv submodule for arch. Changing zshrc powerline directory for Arch

.gitmodules

@@ -13,3 +13,6 @@
 [submodule "bin/cortex-git"]
 	path = bin/cortex-git
 	url = git://glacicle.org/projects/cortex.git
+[submodule "bin/rbenv-git"]
+	path = bin/rbenv-git
+	url = git://github.com/sstephenson/rbenv.git

bin/rbenv-git

@@ -0,0 +1 @@
+Subproject commit 6a6ae8ae4667dd8c95cae359f92819b6d1d1320b

zshrc

@@ -2,7 +2,8 @@
 # if [ "$TMUX" = "" ]; then tmux; fi
 
 # Powerline
-. /usr/local/lib/python2.7/site-packages/powerline/bindings/zsh/powerline.zsh
+[[ -s /usr/local/lib/python2.7/site-packages/powerline/bindings/zsh/powerline.zsh ]] && . /usr/local/lib/python2.7/site-packages/powerline/bindings/zsh/powerline.zsh
+[[ -s /usr/lib/python2.7/site-packages/powerline/bindings/zsh/powerline.zsh ]] && . /usr/lib/python2.7/site-packages/powerline/bindings/zsh/powerline.zsh
 
 # Tmuxinator
 [[ -s $HOME/.tmuxinator/scripts/tmuxinator ]] && source $HOME/.tmuxinator/scripts/tmuxinator