timer.init() removed (timer module now auto-initializes)

Calling timer.init() now throws an error. Please remove all these
calls from the code base.

(It was lousy API design to require an explicit init call.)
Remove timer.init() calls/references from the codebase

This function was removed/obsoleted by the previous commit.
Merge pull request #257 from SnabbCo/timerapi

Timer API update