Tweaked Zendesk wording.
Initial version of Microsoft Team Foundation Server service

Add new service, has configure options for basic authentication against
the Visual Studio Online API.
Add workitem resource
Split ruby version and gemset into two files

This changes makes the ruby version file compatible with rbenv
Add posibility to create features
Add possibility to sync requirements and taks
Swap project selection and mapping selection
Do not try to sync tasks or requirements if there are none
Move API version to constant
Add documentation
Upgrade to API version 1.0-preview.2

Use the API version 1.0-preview.2
This simplifies a lot of things
Finally creating integration fields
Move the default header to the default_http_options method
Add support for receiving updates from webhooks
Remove tasks code, add more webhook code
Add attachment resource, sync attachments
Add basic workitem update mechanism
Refactoring, split code into more resources

Prepare for additional sync code by spliting the code into more
resources.
Only update fields if necessary
Update an requirement in Aha! when linked workitem changes