Behaviour fixes and speed improvements from the Open Systems team.

Merge pull request #18 from benburkert/v3-key-param

fix v3 key parameter name

Support for Safe Browsing API v3.

Props to Kilian Gilonne @kgilonne for this work.

Bundle in the hat-trie library to remove system-level dependency.

Addition of example web server, addition of back-off behaviour for re…

…quests for full hashes and a bugfix with the calculation of host hashes for parent domains.

Release of memory optimised version based on hat-trie.

Initial release of the safe browsing API