Remove Nokogiri lock and update README for Ruby support
initial model / service for Purchase Entity, with specs
added AccountBasedExpenseLineDetail for PurchaseLineItems
First attempt at a Travis-CI yml
specify language
Travis doesnt support Ruby 2.1.0, yet
Merge pull request #29 from harvesthq/drop-1.8.7

Drop 1.8.7/REE/1.9.2 support
added TxnTaxDetail for Purchases
Added Travis build avatar to README, add myself to travis-ci notifications
Merge branch 'entity-purchase' of git://github.com/sequielo/quickbooks-ruby into sequielo-entity-purchase

Conflicts:
	lib/quickbooks-ruby.rb
Added Purchase to list of supported entities
Added Bill and BillPayment to list of entities
Merge pull request #31 from sequielo/patch-1

Added Bill and BillPayment to list of entities
implemented model / service for PurchaseOrder entity, with specs
Merge pull request #32 from sequielo/entity-purchase-order

implemented model / service for PurchaseOrder entity, with specs
implemented model / service for VendorCredit entity, with specs
implemented model / service for Estimate entity, with specs
Merge pull request #33 from sequielo/entity-vendor-credit

Implemented model / service for VendorCredit entity, with specs
Merge pull request #34 from sequielo/entity-estimate

implemented model / service for Estimate entity, with specs