Json Output pre-processed

After discovering that an Node.js port (see https://github.com/dangrossman/node-browscap) of browscap-php exists I saw they are parsing the ini files with Javascript. Because I'm thinking handling a json file with Javascript is faster, I created an Generator to write a json version of the browscap.ini.

This adds an modified (from the first try in #244) Json Generator which creates a json file like the php cache from browscap-php. This also adds some tests where the test-Uas from node-browscap are tested here.

A Changed implementation for node-browscap you can find here: https://github.com/mimmi20/node-browscap