Merge pull request #189 from halorgium/task-thread-exceptions

TaskThread does not raise exceptions outside
Merge pull request #159 from halorgium/shutdown-timeout-accessor

Why is SHUTDOWN_TIMEOUT a constant?
Merge pull request #151 from halorgium/fix-pool-manager-respond-to

PoolManager respond_to issues
Call private finalizers (fixes #167)
Add 'celluloid/autostart'

After so many complaints that simply requiring Celluloid automatically
spins up actors, I decided to split up merely loading Celluloid from
the portions that spawn actors on boot.
Bump version to 0.13.0.pre2
Update examples to use celluloid/autostart
Don't access @exclusive_methods if undefined (fixes #191)
Bump version to 0.13.0
Fix CPUCounter on Windows (closes #192)
Fix misspelt method name in changelog
Merge pull request #194 from gf3/changes-spelling-mistake

Fix misspelt method name in changelog
Implement proxying for blocks between actors

By default, blocks are run on the sending actor

Add a syntax for declaring that blocks run on the receiver
Use the BlockProxy in the BlockCall