Use __signature__ (but probably incorrectly)
Merge branch 'master' into python3
Move Travis CI button to its own section
Describe contribution guidelines in readme

Refers to github PRs and also very basic coding and committing guidelines.
Extend usage description by output

Before the output of the example code was not shown. Now this has been added
for completeness.
Fix tests for compatibility with pypy

The pypy garbage collector can not be relied upon to be run immediately after
the deletion of the last hard reference to an object. Our tests previous relied
on this implementation detail of CPython, which is not part of the
specification though. Therefore, the garbage collection has to be run manually
to ensure proper execution of the tests in pypy.
Reenable pypy tests in Travis CI

Since the tests have been fixed for pypy, continuous integration for that
platform can be reenabled.
List supported platforms in readme

The Travis CI build ensures that the module works on different platforms. They
are now listed in the readme file.
Merge branch 'topic/pypygc'

This branch addresses the compatibility problem with pypy raised in issue 6,
see https://github.com/aepsil0n/obsub/issues/6 . pypy is now fully supported by
obsub.
Ignore garbage collection return value in doctest

The behaviour of the garbage collector apparently differs in different Python
releases with respect to how many unreachable objects are found during a full
collection. This ignores the output, since it does not matter for the tested
functionality. Thereby it fixes #10.
Merge branch 'issue/10'
Merge branch 'master' into python3
Convert markdown to reST for PyPI in setup.py
Use assignment to hide output from garbage collector

This should be easier to read.
Use pip as canonical install command in Travis CI testing
Read README.rst instead of converting it in setup.py

This saves a hell lot of trouble regarding existing modules, executables
and files. Conversion should be done manually, like so:

pandoc README.md -o README.rst

Note: you cannot use reST documents with internal links for PyPI.
Ignore README.rst

This has to be created before using setuptools from README.md
Merge branch 'cosmetics'
Use gc.collect() to test that no memory is freed where it shouldn't
Delete the obvious hard-ref to the object before invoking gc