add new waitlist from refactor
update History.md
bump version on readme
fix wait method on subscription handle extension

this.subscribe('..').wait()
oops fix wait() api method to use controller wait
bump version to 0.8.1
fix controller global data setting

Changes in behavior mimic the next-gen refactor branch. Specifically:

1. The data option will be passed directly to the layout function and
not called by the controller automatically.

2. The data function will only be called if a template explicitly calls
it or you call it inside one of your route functions.

3. No more onData hook
bump versions
add back a data function people can call if they want
Merge https://github.com/EventedMind/iron-router into devel