Fixed proxy creation path.

Uses the original reflection class's filename as base for proxy
class's path as not all namespaces correlate directly to
filesystem path.
Removed irrelevant namespace-related string replace.
Merge branch 'andy-shea-reflection-class-getfilename-fix' into 0.x

* andy-shea-reflection-class-getfilename-fix:
  Removed irrelevant namespace-related string replace.
  Fixed proxy creation path.