Add new timezone field to organisation record

Xero added a timezone field to the organisation object, recently.
Added archive status to contacts
Merge pull request #153 from warrenchaudhry/add_archive_status_to_contacts

Add Archive Status to Contacts
Merge pull request #150 from clodeindustrie/patch-1

Add Timezone Field to Organisation
change ARCHIVE status to ARCHIVED
Merge pull request #154 from warrenchaudhry/add_archive_status_to_contacts

Change ARCHIVE Status to ARCHIVED
add include_archived params for contacts
Merge pull request #155 from warrenchaudhry/add-include-archived-params

Add include_archived Params for Contacts
Add datetime_utc type to http_proxy

This allows fields of type datetime_utc to be used in where clauses.
The datetime_utc type was added in commit
cdae18e1694e3ce6aa9d333f3443f6d4591ad283 but was never added to
base_model_http_proxy, so you get empty where conditions when you
try to filter on fields of that type. This commit fixes that.
Merge pull request #157 from FiguredOnFarm/add-datetime-utc-field-type

Add datetime_utc Type to http_proxy