Rename search function args `limit` and `offset` to `maxResult` and `start` to correspond to yummly api parameter name.

Add support for keyword parameters used in yummly search.
Add short wait function and call before each test.
Move setUp() code to setUpClass() and add wait to setUp().
Add missing field to AssertionError in verify_fields().
Rename limit and offset to reflect changes in yummly.search().
Remove wait() calls since setUp() now calls them before each test.
Rename self.test_recipe/_id attribute to self.sample_recipe/_id to avoid conflict with class methods (doh!)
Add tests for search parameters.
Update README with yummly.search() arg changes and search parameters example.
Bump version number.