Api tests - initial commit

Initial commit of Api Tests.
The initial structure for the tests resembles that of other projects, with the test being located under ./tests/api .

To run the tests:
1. *pip install -r deuce/tests/test-requirements.txt*  . The requirements for the api tests include:
nosetests
jsonschema
ddt
opencafe
2. Make a copy of *deuce/tests/api/etc/tests.conf.sample* and edit it with the appropriate information for the deuce base url of the environment being tested
3. Set up the following environment variables:
__CAFE_CONFIG_FILE_PATH__ (points to the complete path to your test configuration file)
`export CAFE_CONFIG_FILE_PATH = ~/.project/tests.conf`
__CAFE_ROOT_LOG_PATH__ (points to the location of your test logs)
`export CAFE_ROOT_LOG_PATH=~/.project/logs`
__CAFE_TEST_LOG_PATH__ (points to the location of your test logs)
`export CAFE_TEST_LOG_PATH=~/.project/logs`
4. `cd deuce/tests`
`nosetests --with-xunit api`
Note: You may want to redirect stderr to a file. Opencafe's logging captures all the requests and responses and nosetests outputs the capture data when a test fails, including all binary (block) data 
All the TODOs that do not have an additional comment are actually followed by skipTest statements indicating why the test is getting skipped.
Other TODOs (like require additional validation) are commented