created transaction_test and transation file
Added transation_test and transation file
Added invoice and invoice_test... working on transaction_repo_test and transaction_repo
removed lib/transaction_repository.rb and test/transaction_repository_test.rb due to repeatition and wierd stashing
Merge branch 'master' into transaction_class
Merge pull request #18 from srt32/transaction_class

Add transaction class and test and fixtures, invoice class and test and fixtures