Include gems dir in .gitignore
Include gems dir in .gitignore

Since communal-gems is maintainer-approved, thought it would be useful to include the directory it uses in the ignore list.

(This also helps me, since I install rbenv as submodule and without this entry, the submodule is perpetually marked dirty.)
cehoffman/nodenv,cehoffman/pyenv,syndbg/goenv,docwhat/rbenv,yyuu/pyenv,jeremy/rbenv,jmatbastos/rbenv,jmatbastos/rbenv,jasonkarns/rbenv,sstephenson/rbenv,sstephenson/rbenv,cehoffman/nodenv,jrolfs/nodenv,genome-vendor/pyenv,viclim/rbenv,pyenv/pyenv,yyyc514/rbenv,jeremy/rbenv,zmwangx/pyenv,zmwangx/pyenv,OiNutter/nodenv,cehoffman/rbenv,cehoffman/rbenv,jasonkarns/rbenv,BanzaiMan/pyenv,Angeldude/rbenv,yyyc514/rbenv,sebhahn/pyenv,Angeldude/rbenv,sebhahn/pyenv,mediadoneright/rbenv,nodenv/nodenv,jmatbastos/rbenv,yyyc514/rbenv,jmatbastos/rbenv,jeremy/rbenv,jmatbastos/rbenv,yyuu/pyenv,rbenv/rbenv,docwhat/rbenv,pyenv/pyenv,bradynpoulsen/rbenv,bradynpoulsen/rbenv,nodenv/nodenv,bradynpoulsen/rbenv,mediadoneright/rbenv,rbenv/rbenv,mediadoneright/rbenv,OiNutter/nodenv,pyenv/pyenv,BanzaiMan/pyenv,jmatbastos/rbenv,viclim/rbenv,cehoffman/rbenv,syndbg/goenv,viclim/rbenv,jmatbastos/rbenv,Angeldude/rbenv,sstephenson/rbenv,cehoffman/pyenv,syndbg/goenv,syndbg/goenv,genome-vendor/pyenv,docwhat/rbenv,jrolfs/nodenv,jasonkarns/rbenv,sebhahn/pyenv