Added support for editing new posts with --edit

The editor and editor command string can be changed in .frogrc. The
editor will only be launched when --edit is specified with -N or -n.
Merge pull request #77 from bluephoenix47/master

Added IntenseDebate and LiveFyre widgets
Merge pull request #78 from bluephoenix47/editor

Added support for editing new posts with --edit
Update THANKS.md
Update README.md for commit 929b2f3
Added some git related widgets

* Added gist widget. Almost not worth it.
* Added gittip widgets.
Merge branch 'master' of github.com:greghendershott/frog