Fix 1 error and 2 failures in unit tests under Python 3, e.g.:
```
FAIL: test_render (unit.visualizations.plugins.test_VisualizationPlugin.VisualizationsPlugin_TestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/travis/build/galaxyproject/galaxy/test/unit/visualizations/plugins/test_VisualizationPlugin.py", line 180, in test_render
self.assertIsInstance(response, string_types)
AssertionError: b'\nTrue\n' is not an instance of (<class 'str'>,)
```
- Add flake8-import-order to flake8 Pipfile and remove py27-lint-imports
and py27-lint-imports-include-list tox envs
- Fix most E201 and E202 errors reported by flake8-import-order v0.15,
but pin flake8-import-order to v0.14.3 until
https://github.com/PyCQA/flake8-import-order/issues/123
is fixed
This let us drop 2 jobs on Travis per each job.
not only for converting jupyter notebook to HTML (with nbconvert) but also
where ipython/IPython was referenced.
Some files still contain ipython but this is mostly related to documentation or
to the IE docker container itself.
Basically adds __init__.py files to each subdirectory so nose detects these as Python module directories. Also modify dynamic loading of modules in Carl's test cases so the test case can be run with any cwd - including the Galaxy root directory as run_unit_tests.sh will use.
This should roughly double the number of unit tests buildbot runs.
Nicola Soranzo