Fix wrongly defined operator methods in Context
Fix wrongly defined operator methods in Context

This is equivalent to method_missing in Ruby. A better solution would be
to correctly define the methods dynamically on the class, but that's
unnecessarily complicated. Python 3.4 added handy function partialmethod
that would be ideal for this case, but I should keep sublimedsl
compatible at least with 3.3.

jirutka/sublimedsl