Revert inspectlet

Not sure why I ever put this in, as there was no project setup for it
to capture any data on the server.
Downgrade guard-livereload

The Chrome plugin I'm using requires an older version of the protocol
than the one in use by the latest version (1.4) of guard-livereload.
Upgrade bundled gems
Remove Maruku

It wasn't rendering full stops at the end of paragraphs for some reason.
Didn't bother to investigate; it's not worth the effort.
Updated credits for 0.10.0 and re-wrote /about