Send PUT/POST bodies inside an xml parameter, as per http://blog.xero.com/developer/api-overview/http-methods-and-filters/
Fixed get_contact to correctly retreive a single contact. Fixed the endpoint naming to respect that of the API2.0 (capitalized, pluralized resource endpoints).
Fix http://github.com/tlconnor/xero_gateway/issues/#issue/3
add invoice status to invoice xml
Replace returning with Array.tap
bump version
Update tracking category to reflect new XML structure
Update tracking category to reflect new XML structure
Text
Use bundler for dependencies
Add bundler
Removes tax_inclusive and includes_tax from README
Only set ModifiedAfter param if present

Fixes bug whereby if gateway.get_invoices is called without a
:modified_since argument, the following URL is called from Xero:

  https://api.xero.com/api.xro/2.0/Invoices?ModifiedSince=
Correcting documentation for get_invoices
Fixes broken ModifiedAfter param in get_contacts

request_params[:ModifiedAfter] must be an instance of Time, not a
string, as the utc() method gets called on it from
XeroGateway::HTTP#http_request
Rename :updated_after to :modified_since

Renames the :updated_after option in get_contacts to
:modified_since to match get_invoices.  Shows depracation warning
if old form (:updated_after) is used.
Adds missing attributes to XeroGateway::Account

account_id
system_account
enable_payments_to_account
Adds handling of CreditNotes
Update gemspec
Readme for CreditNote methods

Includes removal of due_date attribute from credit notes.