Update invalid YAML

A few opcodes fail to parse with current YAML parsers (* and >=)
Update Proc#arguments extension

The existing implementation depended on ParseTree, which does not
support Ruby 2.0+. Fortunately, Ruby 1.9.2+ includes the `parameters`
method which does exactly what we need.
Update specs for RSpec 3

Fix a few deprecations and minor failures along the way.
Fix segfault in server spec

This appeared to be caused by double-quitting. Quit now clears and
checks @thread to be a bit more conservative, though I'm sure this could
be handled better.