Fix 0.8.2 support

this.__templateName is only available from v0.8.3
Merge pull request #33 from meteorhacks/fix-support-for-0.8.2

Fix 0.8.2 support
Remove console.log
Update existing tests to include `info`
Remove console.log
Update existing code to set info
Add template helpers info
Disable adding Meteor.call events
Refactor utils.js

Use `events` format for `info`
Ignore observe events created by blaze (by checking return value)
Fix bugs: setInfo called outside the callback
Fix tests for updated `info` format
Add timestamp to zone info
Add timestamp for events
Reuse a function to hijack helpers
Use `_avoidZones` instead of `_doNotTrack`