[bash] A handful of updates to the .bashrc file

 * Change Emacs.app path to start from HOME
 * Add a red unicode heart to $PS1
 * Silent virtualenvwrapper detection failure
 * Add the ~/.local/bin directory to $PATH
 * Add /usr/local/heroku/bin to $PATH

Notice that if virtualenvwrapper is not present things will just fail
silently, no other virtualenv related stuff will be called.
[bash] Fix emacs alias for Mac OS X