Merge pull request #69 from korczis/devel

Require bundler in Rakefile
Merge pull request #70 from korczis/devel

Moved dev dependencies to general section
Merge pull request #71 from korczis/devel

Devel
Merge pull request #72 from korczis/devel

Updated version of apollo-crawler gem
Merge pull request #73 from korczis/devel

Require apollo-crawler gem version 0.1.31
Merge pull request #74 from korczis/devel

Updated