Fix dependency version issues

Remove Gemfile.lock, built gem

Move dependencies require calls to rubill.rb

Update Gemspec, Invoice#send_email

Updated gemspec to follow RubyGem conventions. Refactored Invoice#send_email to take flexible arguments, added some docs. Moved attachment logic out of Session, and allowing "_top_level_data" to be passed.

Customer find_by methods

Create Customer::find_by_email and Customer::find_by_account_number

Patch Location and ActgClass inheritance bug

0.1.7: Merge pull request #18 from Chebotarev/update-entities

Update entities

0.1.6

Add attachment to manifest, bump version.

0.1.5

Fix typo in previous release.

0.1.4

Fixed issue with BillPayment and SentBillPayment files not being found.

0.1.3

Bump version to 0.1.3