fix nil path when not using gist cache
Added safe_wrap (escaping markdown and textile) to cached gists. Closes #917
Merge pull request #916 from Keithbsmiley/2.1

Fix nil path when not using gist cache
Switched Markdown processor from rdiscount to redcarpet
Fixes for Redcarpet
- Removed unnecessary content filtering for escaping markdown
- Escaping codeblocks defaults to false and can be enabled by passing escape:true
- Backtick codeblocks are automatically escaped when using Textile
- Scoped styling of .highlight divs to figure elements
Enabled nice default extensions for redcarpet
Removing .rvmrc
Using .ruby-version instead of .rbenv-version
Merge pull request #919 from imathis/unified-rb-vers

Unified .ruby-version file