Move templated dep readme section to the docs.
Update the installation instructions along with those in the docs.
Nicer top-of-readme links, including a mailing list link.
Some minor re-wording in the licensing section.
Revert "Re-add `babushka search` as a stub that explains the removal."

This option can go now.

This reverts commit c858cd31619b85e94a61504678745d1696e5d7d2.

Conflicts:
	lib/babushka/cmdline.rb
Merge branch 'master' into docs
Remove readme info on running deps that's present in the docs.
Remove the llvm example from the readme.

Move some of the notes to the docs.
Move the cucumber runtime example to the docs.
Remove the note about deps running any code; it's covered in the docs.
Move dep sources section from the readme to the docs.
Merge branch 'docs'