Allow a propertyTester in org.python.pydev.debug/plugin.xml to accept all objects.

While using the PyDev perspective, attempting to view a "Run As..." menu on a non-Python
file causes an error where viewing a "Run As..." again no longer shows any options for
Python files (other than "Run on server"). Error is caused by mismatched types between
files and a propertyTester, so allow the tester to accept all Objects.
Merge pull request #26 from AndrewFerr/proptest_problem

Add a new propertyTester as an extension to org.python.pydev.debug/plugi...