Run more tests in travis

Travis has some limitations so this patch sets up some tricks to run the
functional tests.

.travis.yml

+sudo: required
+services:
+  - docker
+
 language: python
 python: 2.7
 env:
   - TOX_ENV=py34
   - TOX_ENV=py27
   - TOX_ENV=pep8
+  - TOX_ENV=docs
+  - TOX_ENV=noop_py
+  - TOX_ENV=noop_cli
 install:
   - pip install tox
 script:
   - tox -e $TOX_ENV
+after_success:
+  if [ "$TOX_ENV" = "noop_py" ]; then ./tools/py_functional_tests.sh; elif [ "$TOX_ENV" = "noop_cli" ]; then ./tools/functional_tests.sh; fi

tox.ini

@@ -5,6 +5,7 @@ envlist = py35,py34,py27,pep8
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
+whitelist_externals = true
 usedevelop = True
 install_command = pip install {opts} {packages}
 
@@ -30,3 +31,13 @@ commands = python setup.py build_sphinx
 [testenv:cover]
 commands =
    python setup.py testr --slowest --coverage --testr-args="{posargs}"
+
+[testenv:noop_cli]
+usedevelop = True
+install_command = true {opts} {packages}
+commands = true
+
+[testenv:noop_py]
+usedevelop = True
+install_command = true {opts} {packages}
+commands = true