Bump up all the versions.
Rename the 'pygments' option to 'highlighter'.
As recommended by Jekyll 2.0.0
Merge pull request #55 from yihangho/master

Bump up the versions of Jekyll and other dependencies
Exclude Gemfile, Gemfile.lock, LICENSE and README.
Fixes #57

Update "read up here" link.
Merge pull request #58 from yihangho/exclude-files

Exclude Gemfile, Gemfile.lock, LICENSE and README.
merged