[TIP] merging requirements.txt with specified deps

[Antony Seedhouse]

Is there a way to "merge" tox deps with requirements.txt, without having to
split requirements.txt into multiple files (one per dep specified in
tox.ini) or other more complicated methods?

For example, I have a project with all current dependencies in
requirements.txt, and would like to test it with multiple versions of django

I would like my deps = to look like:

deps =
  -r../requirements.txt
  django17: Django>=1.7,<1.8
  django18: Django>=1.8,<1.9

This would tell tox to overwrite the Django version in requirements.txt
with the environment specified version

Currently this errors: Double requirement given: Django==1.7.7 (from -r
../requirements.txt (line 3)) (already in Django<1.8,>=1.7, name='Django')
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