Vanity URL for the installer

Made with
`https://github.com/bbatsov/prelude/raw/master/utils/installer.sh`

More info: https://github.com/bbatsov/prelude/raw/master/utils/installer.sh
Use valid shell commands

By not prepending `$` to your examples users can copy them easier
without fear of seeing `bash: $: command not found` or similar
Merge pull request #333 from joshuarh/vanity-url

Vanity URL for the installer
Merge pull request #334 from joshuarh/valid-shell-commands

Valid shell commands
Bind prelude-top-join-line to C-^
Merge branch 'master' of github.com:bbatsov/prelude

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.
Fix #337 - don't promt for sudo passwd for non-existing directories
Add some extra keybindings

`prelude-smart-open-line` is now bound to `M-o` as well
`prelude-start-open-line-above` is not bound to `M-O` as well
updated ELPA packages
Merge remote-tracking branch 'prelude/master'