Fix typo

Change Contibuting header to Contributing
Merge pull request #173 from quelledanielle/patch-1

Fix typo
New Jekyll Docs location
Merge pull request #178 from skopp/patch-1

New Jekyll Docs location
Changes 'jekyll --server' to 'jekyll serve' in quick start guide.
Merge pull request #190 from ayanonagon/gh-pages

Changes 'jekyll --server' to 'jekyll serve' in quick start guide.
Merge branch 'master' into HEAD