Merge pull request #163 from arthurchui/fault-detail

Added Fault#detail
added type to BaseReference
added missing spec for new type attribute
Merge pull request #167 from verifyvalid/master

added type to BaseReference
handle nil class error for linked_transaction in line.rb #168
Merge pull request #169 from muhammad-abubakar/master

handle nil class error for linked_transaction in line.rb #168
Add exchange_rate and home_total_amount to the invoice model

These fields are only present in invoices from non-USA QB accounts
Added definition of entity type
Merge pull request #170 from ahey/master

Add exchange_rate and home_total_amount to the invoice model
Add global_tax_calculation to Invoice model.
Merge pull request #171 from michaelcheung/global_tax_calculation

Add global_tax_calculation to Invoice model.
Update README.md

Added link to contributors
fix custom field xml accessor typo
Merge pull request #172 from waelchatila/master

fix custom field xml accessor typo
Add global_tax_calculation to all transaction entities that use it.
Merge pull request #173 from michaelcheung/global_tax_calculation

Add global_tax_calculation to all transaction entities that use it.
Merge branch 'master' of github.com:ruckus/quickbooks-ruby

* 'master' of github.com:ruckus/quickbooks-ruby:
  Add global_tax_calculation to all transaction entities that use it.
  fix custom field xml accessor typo
  Update README.md
  Add global_tax_calculation to Invoice model.
  Add exchange_rate and home_total_amount to the invoice model