Read timezone information at startup from a JSON file:

This change makes it easier to use the library in a browser using
browserify. The JSON file is generated from the offical Olson database
using the node-preparse tool of timezone-js. This commit also removes the
previously used in tree Olson database.
Merge pull request #9 from peterkooijmans/master

Read timezone information at startup from a JSON file: This change makes it easier to use the library in a browser using
browserify. The JSON file is generated from the offical Olson database
using the node-preparse tool of timezone-js. This commit also removes the
previously used in tree Olson database.