Remove dependency on mediashelf-loggable
Use the system libxml2 on travis
Bump solrizer version to ~> 3.3
Merge pull request #55 from projecthydra/travis_nokogiri

Use the system libxml2 on travis
Merge pull request #54 from projecthydra/no_mediashelf_loggable

Remove dependency on mediashelf-loggable
Merge pull request #56 from projecthydra/solrizer_3.3

Bump solrizer version to ~> 3.3
Prepare for 3.1.0
Use HTTPS URLs for RubyGems
Merge pull request #57 from cokernel/use_https_urls_for_rubygems

Use HTTPS URLs for RubyGems
Merge remote-tracking branch 'upstream/master'