Rails 4 support
rspec-rails 2.14.1 now needs ActiveRecord::VERSION defined

https://github.com/rspec/rspec-rails/commit/31ba3e5e40a16980b1580d1fac5fa9acf7588e15
Bump version
add syntax highlighting
better organization and naming for new syntax highlighting support
add instructions in readme for syntax highlighting
Whitespace
Include syntax highlighting stylesheet in default layout
Fix rendering of ERB in post content
Update tests for syntax highlighted fenced code blocks
Capitalisation
Wording
Merge pull request #23 from jess/master

Add syntax highlighting

Closes #23

* syntax-highlighting:
  Wording
  Capitalisation
  Update tests for syntax highlighted fenced code blocks
  Fix rendering of ERB in post content
  Include syntax highlighting stylesheet in default layout
  Whitespace
  add instructions in readme for syntax highlighting
  better organization and naming for new syntax highlighting support
  add syntax highlighting
Bump version
Replace Timecop dependency with a simple stub
Explicitly reset Delorean after each test
extract visible query out of Post.all

- allows Post.all to now include "all" (future and past) posts
- adds a visible option to where ex: visible => true will only select
  past posts
- add Post.visible to query all past posts
added option to `allow_preview`

- defaults to false
- if set to true future posts can been seen in the browser
remove todo: add syntax highlighting (already done)
change title to be more descriptive on allow preview documentation