[Tests] Add Travis CI + Coveralls.io code coverage

Adds the files `.travis.yml` and `.coveragerc` enabling testing on Travis CI and
code coverage statistics on Coveralls.io, similar to the parent MongoEngine repo
(https://github.com/MongoEngine/mongoengine).

Should fix issue MongoEngine#4.
(Somebody may have to login to travis-ci.org to get things going)

.coveragerc

@@ -0,0 +1,9 @@
+# Test coverage configuration.
+# Usage:
+#   pip install coverage
+#   coverage erase  # clears previous data if any
+#   coverage run -m unittest2
+#   coverage html  # creates ./htmlcov/*.html (check index.html)
+[run]
+branch = true
+source = extras_mongoengine

.gitignore

@@ -1,3 +1,7 @@
 *.pyc
 build/
 venv/
+
+# Coverage
+/htmlcov
+/.coverage

.travis.yml

@@ -0,0 +1,48 @@
+language: python
+python:
+- '2.6'
+- '2.7'
+- '3.2'
+- '3.3'
+- '3.4'
+- pypy
+- pypy3
+env:
+- PYMONGO=2.7
+- PYMONGO=2.8
+- PYMONGO=3.0
+- PYMONGO=dev
+matrix:
+  fast_finish: true
+before_install:
+# Install MongoDB
+- travis_retry sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
+- echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' |
+  sudo tee /etc/apt/sources.list.d/mongodb.list
+- travis_retry sudo apt-get update
+- travis_retry sudo apt-get install mongodb-org-server
+install:
+# 1. Install Python
+- sudo apt-get install python-dev python3-dev
+# 2. Install general requirements (Python packages)
+- pip install -r requirements.txt
+# 3. Enums in Python only became available in 3.4.
+#    The package `enum34` listed in `requirements-python<3.4.txt` is a backport.
+- if [[ $TRAVIS_PYTHON_VERSION == 2* ]];     then pip install -r 'requirements-python<3.4.txt'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 3.2* ]];   then pip install -r 'requirements-python<3.4.txt'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 3.3* ]];   then pip install -r 'requirements-python<3.4.txt'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == pypy* ]]; then pip install -r 'requirements-python<3.4.txt'; fi
+# Coverage 4.0 doesn't support Python 3.2. Install an older version
+# before coveralls tries to install the latest. (pypy3 is really Python 3.2)
+- if [[ $TRAVIS_PYTHON_VERSION == '3.2' ]];   then travis_retry pip install 'coverage<4.0'; fi
+- if [[ $TRAVIS_PYTHON_VERSION == 'pypy3' ]]; then travis_retry pip install 'coverage<4.0'; fi
+- travis_retry pip install tox>=1.9 coveralls
+#- travis_retry tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- -e test
+script:
+#- tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- --with-coverage
+# Run tests with coverage (similar to `python -m unittest2`
+# or `unit2` on Python 2.6.
+- coverage run -m unittest2
+after_script:
+# Submit coverage to coverall.io
+- coveralls --verbose

requirements-python<3.4.txt

@@ -0,0 +1 @@
+enum34