Add `prelude-github`

Conflicts:
	core/prelude-core.el
Use move-text to allow moving up or down of the selected region as well
[Fix #365] Don't indent with tabs in c-mode
[Fix #391] Ask for confirmation before deleting a file that's not under VC
Enable smartparens-strict-mode in Lisps
Add a few extra Magit keybindings
Make some initial tweaks
Use solarized-dark
Add hooks for diff-hl-mode
Add some keybindings
Add open-root-in-source-tree
Add some saner defaults
Add some packages and move external-apps file into autoloaded path
Add rbenv
Add ruby-block
Add org-mode capture-work-note
Add some keybindings
Add standup notes capture template
Move some ruby-mode setup to an after-load hook
Change SourceTree keybinding