Berkshelf is pointing to master of berkshelf-api for tests.

We need to set berkshelf to always_build otherwise we get errors similar to this when running it:

/opt/chefdk/embedded/lib/ruby/gems/2.1.0/gems/bundler-1.5.2/lib/bundler/spec_set.rb:92:in `block in materialize': Could not find berkshelf-api-1.2.1 in any of the sources (Bundler::GemNotFound)
Put berks to the end of the dependency list in chefdk since it's now always building.
Merge pull request #166 from opscode/berks-git-test

Set always_build on Berkshelf