Remove Gemfile.lock, built gem

Move dependencies require calls to rubill.rb

Remove hard dependency of rest-client and json

Release to RubyGems from Travis

Merge pull request #18 from Chebotarev/update-entities

Update entities

Add attachment to manifest, bump version.

Add .rb extensions to files, bump to 0.1.5

Include BillPayment and SentBillPayment files in gemspec, bump to 0.1.4

Bump version to 0.1.3