IPP v3 cash purchase example.
Purchase examples.
v3 Payment add example.
Bill payment v3 examples.
CompanyInfo and Preferences v3 examples.
Examples.
XPath example.
Tweaks to qbXML classes.
Tweaks to qbXML classes.
Tweaks to qbXML classes.
Tweaks to qbXML classes.
Updated invoice add example.
A few updates

- Ignoring PHPStorm IDE project folder
- Fixing XML_DROP constant error in SalesOrder object
Adding method "addSalesOrderLine" to SalesOrder.php
Merge branch 'refs/heads/hotfix/so' into develop
Fixing bug in setAmount for SalesOrderLine.php
Merge branch 'refs/heads/hotfix/so' into develop
SalesOrder asQBXML signature matches Object now
Merge branch 'refs/heads/hotfix/so' into develop
Fixing SalesOrder methods