Upgrade to Liquid 2.5.2
Update CONTRIBUTING docs for better PRs.
Merge pull request #1536 from mojombo/liquid-2.5.2

Upgrade to Liquid >= 2.5.2, < 2.6
Update history to reflect merge of #1536
Print better messages for detached server. Mute output on detach.
Cleanup newlines in Commands::Serve
add coveralls to gemfile
setup coveralls for cucumber
setup coveralls for unit tests
enable coveralls on Travis-CI
add status badge to README
Merge pull request #1537 from mojombo/better-pr

Update CONTRIBUTING docs for better PRs
Update history to reflect merge of #1537
simplify conditions for coverage reports
Update Contributing page in the docs to match the new CONTRIBUTING.markdown. #1537.
Update JekyllImport::WordPress instructions on docs site.

Closes #1548.
Merge pull request #1518 from mojombo/fix-serve-detatch

Print better messages for detached server. Mute output on detach.
Update history to reflect merge of #1518
Fix site:releases:new rake task.
Update the History file