use wercker instead of travis-ci to enable full test harness

Before this commit: We use travis-ci (ubuntu vm) to run
just the unit tests. We cannot run functional tests on
travis-ci due to lack of platform support.

After this commit: Run the full dockerized test harness on
http://wercker.com to run `hacking/runtests.sh`, which runs
all the unit and functional tests on el5, el6, and f20 to
assert supportability on all the pythons 2.4 through 3.x.

Sample test runs are at:
https://app.wercker.com/#buildstep/5346d0054daac943370042c7
https://app.wercker.com/#buildstep/5346d9914daac94337005096

At the above link...

1. Click **run the docker test suite** in browser to show log
2. Scroll all the way through to see the verbose output and
   summary at bottom.

Note: `hacking/runtests.sh` exits non-zero if any test fails
on any of the platforms.

Wercker docs are online at http://devcenter.wercker.com/#

.travis-install-kludge.sh

@@ -1,8 +0,0 @@
-#!/bin/bash
-
-# GitPython does not currently support python3 and
-# may be replaced by pygit2.
-# https://fedoraproject.org/wiki/User:Churchyard/python3
-if [[ $(python --version 2>&1) =~ ^2 ]]; then
-  pip install 'GitPython >= 0.2.0' --use-mirrors --pre
-fi

.travis.yml

@@ -1,12 +0,0 @@
-# http://docs.travis-ci.com/user/languages/python/
-language: python
-python:
-  - "2.6"
-  - "2.7"
-  - "3.3"
-
-install:
-  - ./.travis-install-kludge.sh
-  - pip install 'pep8' --use-mirrors
-
-script: nosetests test/unit

wercker.yml

@@ -0,0 +1,9 @@
+box: wercker-labs/docker
+build:
+  steps:
+    - script:
+        name: print the docker version
+        code: docker version
+    - script:
+        name: run the docker test suite
+        code: hacking/runtests.sh