[FIX] travis: Update travis file to new standard

* Add new matrix
* Add transifex support
* Switch coveralls to travis_after_tests_success
* Move pip requirements to requirements.txt

.travis.yml

@@ -1,16 +1,25 @@
 language: python
+sudo: false
+cache:
+  apt: true
+  directories:
+    - $HOME/.cache/pip
 
 python:
   - "2.7"
 
-sudo: false
-cache: pip
-
 addons:
   apt:
+    sources:
+      - pov-wkhtmltopdf
     packages:
       - expect-dev  # provides unbuffer utility
       - python-lxml  # because pip installation is slow
+      - wkhtmltopdf
+
+before_install:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
 
 env:
   global:
@@ -28,11 +37,10 @@ virtualenv:
   system_site_packages: true
 
 install:
-  - git clone https://github.com/OCA/maintainer-quality-tools.git ${HOME}/maintainer-quality-tools
+  - git clone --depth=1 https://github.com/OCA/maintainer-quality-tools.git ${HOME}/maintainer-quality-tools
   - export PATH=${HOME}/maintainer-quality-tools/travis:${PATH}
   - travis_install_nightly
   - printf '[options]\n\nrunning_env = dev' > ${HOME}/.openerp_serverrc
-  - pip install unidecode pyserial pycountry
 
 script:
   - travis_run_tests

requirements.txt

@@ -0,0 +1,3 @@
+unidecode
+pyserial
+pycountry