DE1464 Fix Storevalue Tender Type in Order Create

Discover that the encrypted panToken was being passed
to the eb2cpayment::getTenderType to get the storedvalue tender type
since the encrypted token didn't match the configure bin range, no
tender type was being sent in the order create. Ensure the proper
pan value is pass to the getTenderType method to get the proper
storedvalue payment tender type.
DE1441 Rollback Make RequestId Unique

RollbackAllocationRequestMessage use uniqid for
requestId and leave reservationId the same
as the AllocationRequestMessage.
DE290 Revise Comments

Add @throws annotations for methods that throw exceptions.
Remove unnecessary comments.
DE290 Use Single Line For Short Comments
DE1476 Remove Untranslatable Xml From Pim Export

Add logistics in the eb2cproduct/pim::_getFeedAttributes to take a storeid
in order to determine if the storeid is for the default store view in order
to return all map export attributes otherwise only return transtlatable attributes.
Modified a few methods in the eb2cproduct/pim class to ensure the proper store id
is passed, and to ensure no empty 'Item' node get created.
DE1476 Styling Fixes
US12936 Cleanup Export Mappings

Add `_` prefix to some mappings that were not actual product attributes
but were missing the prefix.

Remove `before` and `after` XML nodes, support for which was never
added to the product export.
US12936 Product Export Documentation

Bring product export documentation back up-to-date.
DE1476 Code Review Fixes

Make eb2cproduct/pim::_buildItemNode return
empty DOMDocumentFragment even when there's no
attributes to build.
US12212 ROMS Extension Overview Documentation
US12936 Product Export Documentation Cleanup

Fix some wording, typos and inaccuracies.
DE1490 Order Increment Per Instance

Use increment ids that are unique to the entire Magento instance instead
of unique per store. Add an upgrade script that will update the order
entity type setting to not use increment ids per store. Update order
module version to match new release number. Update the order increment
init script to always update the increment id in the "default" store as
orders in all store views will now reference just the last increment of
the default store.
Don't Exclude shell/order_id_init.php from Package
US12212 Overview, Troubleshooting Guides

Added links to new Overview/ Business Features and Troubleshooting Guides to the README.md
Update README.md
Removed Dead Link from README.md
US12949 Open Source Contributing Guide
Merge pull request #129 from micwest/US12949_Open_Source_Contributing

US12949 Open Source Contributing Guide
Added Contribution Document to TOC
US12949 Open Source Contributing Guides Edits