changed to use RSpec 3.0 syntax
updated cli_spec to use 'expect' vs 'should'
updated migrator_spec to use 'expect' vs 'should'
updated post_collection_spec to use 'expect'
updated wp2middleman_spec to 'expect' syntax
updated remainder of cli_spec to use Rspec 'expect'
updated middleman_post_spec to use RSpec 'expect'
updated post_spec to use RSpec 'expect'
removed stubs from cli_spec
removed stubs from migrator_spec
removed stubs from post_spec
Merge pull request #25 from mdb/bundle_update

Bundle update