added doccumentation for fosdick
Fixed order_update message key value
Fixed outgoing message description on the zendesk integration documentation
Initial Hubspot Integration
use json to format
headers
Add metadata description for most API guides
added simparel integration
Mandrill Endpoint Documentation
Changed message key value to order:updated from order:update
Updated order message samples' message value to match actual output
Adding template information to mandrill endpoint doc
Spree Endpoint Guide
RLM Endpoint Filename Documentation
HubSpot integration documentation completed
Added spree:order_poll sample request to spree_integration
Advise people to use the tax cloud extension

Because it was asked about in this thread:

https://groups.google.com/forum/#!topic/spree-user/gV88MEthWXk
Fixed a typo in product_properties.md

Fixes #163
More improvements to RLM Endpoint
Spree Endpoint URL fill ins