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
Unbind conflicting prelude-mode keys.
Don't kill entire symbol at point when doing sp-hybrid-kill
Add a note for updating packages
Merge pull request #396 from climatewarrior/fix-org-bindings

Unbind conflicting prelude-mode keys.
Enable smartparens only for programming modes
Add a comment
Highlight the : in comment annotations as well
Extend update instructions
Add prelude-find-user-init-file
Add prelude-find-shell-init-file
Add anzu
Disable anzu temporarily due to a bug in it
Add prelude-show-foreign-packages
Revert "Disable anzu temporarily due to a bug in it"

This reverts commit 239571f17be8cff4381d583b8ea4388024f11703.