Various updates to the way python editing works

[mahmoudimus]

• Create priority loading for custom configurations
• Remove flymake in favor of flycheck
• Add a better modeline using smart-mode-line
• Change modeline font to Terminus and use Consolas instead of Ubuntu Mono for greek glyph support
• Remove dependency on executing $PATH for OSX since prelude-macosx takes care of this.
• Serious revamping to the way my custom python editing mode works. Replace the deprecated virtualenv.el with virtualenvwrapper.el, replace flymake hooks with flycheck hooks, and setup jedi mode for completion instead of pycomplete. Think about integrating elpy instead of rope/pymacs, etc.