Bugfix for update_port: dealloc port.ip_addresses

* updated tests to check for deallocate as well
Deallocate IP on update_ip_address if no ports
Added port key to POST /ports (update) response
Implemented DRY for update_subnet, updated tests
Bugfix: deallocate_ip_address in-loop deletion

* Refactored deallocate_ip_address such that list traversal was separate
from deleting elements from the list.
* Updated tests.
Fixed IP address response

Fixed ip_address extension responses key
Fixed scope of ip_address db_api calls
Added version to IP address response
Updated IP address unit tests
Implemented DELETE and GET /mac_address_ranges/<uuid>

* Added exceptions.MacAddressRangeNotFound,
  exceptions.MacAddressRangeInUse
* Implemented tests for plugin.get_mac_address_range
* Implemented tests for plugin.delete_mac_address_range
Test if specified address already exists upon create_ip_address
UUID fields are size 36 instead of 255
Merge pull request #85 from asadoughi/put_subnet_2

Implemented DRY for update_subnet, updated tests
Merge pull request #86 from asadoughi/delete_port_ip_fix

Bugfix for update_port: dealloc port.ip_addresses
Merge pull request #88 from asadoughi/dealloc_ip_fix

Bugfix: deallocate_ip_address in-loop deletion
added wiki submodule
Merge pull request #95 from jkoelker/wiki

added wiki submodule
Merge pull request #84 from asadoughi/delete_mac_address_range

Implemented DELETE and GET /mac_address_ranges/<uuid>
Merge pull request #90 from asadoughi/ip_plugin_response

Fixed IP address response
Merge pull request #91 from kilogram/nvp_driver_database

UUID fields are size 36 instead of 255
Merge pull request #96 from asadoughi/update_ip_fix

Deallocate IP on update_ip_address if no ports
Merge pull request #97 from asadoughi/post_update_port_fix

Added port key to POST /ports (update) response
Merge pull request #98 from asadoughi/create_ip_address_fix

Test if specified address already exists upon create_ip_address