Recommend rbenv instead of RVM
Mention brew
Clarify env config
Update syntax highlighting in the README
Changing background color on instruction text

closes #86

Task asked for instructions to be more noticeable.  Changed background
to light yellow to differentiate from text to be corrected.
Merge pull request #89 from seanmac02/master

Change name of IRC channel from #empirical-quill to #quill
Merge pull request #88 from circuitmeister/master

Changing background color on instruction text
Show the answer after a second bad guess.
Merge remote-tracking branch 'original/master'