Allow composite keys in table creation and value retrival
Allow composite keys in table creation and value retrival

Composite keys won't work yet for update or delete, and possibly
other functions. This is the beginning of the work on issue #121.

Additionally, functions deprecated prior to the introduction of
the API have been removed.

Uname-a/knife_scraper,Uname-a/knife_scraper,Uname-a/knife_scraper