Add an 'is it any good?'
Merge pull request #166 from knewter/is-it-any-good

Add an 'is it any good?'
Prevent an "undefined method `to_sym' for nil:NilClass" error when
an actor with an exclusive method handles an ExitEvent
Merge pull request #168 from baconpat/fix_exit_event_problem

Exclusive method and ExitEvent problem
Fetch gems via HTTPS
Modernize platform notes
Build on Ruby 2.0.0
Replace dispatch backtrace spelunking with reflection

Celluloid::Call#dispatch was trying to spelunk backtraces to figure out
whether or not to abort.

Instead of that silliness, we can check the method signature
retroactively to determine if the caller made an error.
Add Ruby 2.0 to platform notes
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Fix broken spec

Yay, gotta love some of the specs people contributed, full of race
conditions just waiting to jump out at ya :|
rbx is failing
Allow conditions to be created from outside of actors
Remove obsolete spec
Better cpu counter on Linux.
Merge pull request #172 from johnae/master

Better cpu counter on Linux
test for TimeoutError when a future expires
raise a TimeoutError when a future expires
handle case where the backtrace is nil
consolidate dump traces to a single string before printing

When running multithreaded, several actors might be printing
dump messages simultaneously. To prevent the messages from
getting comingled to the point of unreadability, build a single
string and use #print to print it. A quirk of IO#print is that
it it not interruptible so each message printed is completed
before another string can be processed.