Make Emacs use bash shell path on Mac OS X

By default Emacs ignores your .bash_profile on Mac OS X.

Here's how to tell Emacs to go do a login so that your PATH customization is available to you when you M-x shell (and other shell-y things like M-x compile and M-x grep).

https://raw.githubusercontent.com/purcell/exec-path-from-shell/master/exec-path-from-shell.el

Found at :

http://stackoverflow.com/questions/6411121/how-to-make-emacs-use-my-bashrc-file