adding a new plugin that captures total time take by a test case including setup and teardown

adding basic test

finally a simple test case working
test case added
addressing asottile's comments

removing pep8 issues
fixing travis error:

1. removing milliseconds from datetime values
2. Letting code do the conversions subtraction for getting the runtime
Merge pull request #295 'osarood/osarood_adding_test_case_time_reporting'

adding test case time reporting