Added more test coverage, got coverage working to find what's missing.

* Got rid of some cruft.
* Added a @factory example.
Implemented runs_after.

* Affects only order.
* If a test noted by "runs_after" fails it will cause the target test to be skipped.
* If a group is run, tests which are marked in "runs_after" will not implicitly be run as well.
Added 'fail' method to Checker class.
Started a tox.ini file.

* Made the nasty run_test.py script usable from Jython.
* Began to look at Python 3 (making this code portable might not be pleasant...).
Continued work with Tox.

* Deleted build.sh script since the coverage is now generated correctly in Tox.
* Fixed a bug in assert_not_equal that seems to only occur in Jython.
* Fixed unit tests for Jython.
Merge pull request #13 from TimSimpsonR/1.2.5.1

Merging in version 1.2.5.1.
Fixed a bug that prevented some Nose plugins from working.
Merge pull request #15 from TimSimpsonR/fix-with-xunit

Merging in 1.2.5.2.

* Fixed a bug that prevented some Nose plugins from working.
Improves groups docs, fix comment typo.
Merge pull request #18 from PaulMcMillan/fixups

Improves groups docs, fix comment typo.
Uses __all__ so 'from proboscis.asserts import *' will only import the asserts.
Adds fail to __all__.
Merge pull request #19 from rackspace/asserts_all

Adds __all__ to asserts
Bumping version to 1.2.5.3.

* Fixing bug in runs_after_groups inheritance.
Merge pull request #21 from TimSimpsonR/1.2.5.3

Bumping version to 1.2.5.3.
update after_class docs for #5
Merge pull request #24 from simon-weber/master

Update after_class docs for #5
Updated README.rst file.
Proboscis now works in Python 3!

* Fixed Proboscis code to work in Python 3.
* The unit and examples tests seem to work in both Python 2 and
  3 now.
* This commit may have fixed a bug which happens when Nose
  is not used and an error occurs.
* Added a script which runs the unit tests which hadn't yet been
  checked in.
* Moved tests/examples directory to examples directory to get not have
  to use a import path hack which didn't play well with Python 3.
Updating version.