[Pytest-commit] Issue #362: support multiple requirements.txt files (hpk42/tox)

[Chad Whitacre]

New issue 362: support multiple requirements.txt files
https://bitbucket.org/hpk42/tox/issues/362/support-multiple-requirementstxt-files

Chad Whitacre:

In our projects we find it useful to have multiple pip requirements files, `requirements.txt` for our main dependencies, and then things like `requirements_test.txt` for test dependencies, and `requirements_docs.txt` for Sphinx.

### Steps

1. Add two `deps` keys to a testenv config section, each specifying a different requirements file using `-r`.
1. `tox -r`

### Expected

Dependencies from both requirements files are installed.

### Actual

`ParseError`: duplicate name 'deps'


```
[aspen] $ tox -r
Traceback (most recent call last):
  File "/Users/whit537/personal/AspenWeb/aspen.py/env/bin/tox", line 11, in <module>
    sys.exit(cmdline())
  File "/Users/whit537/personal/AspenWeb/aspen.py/env/lib/python3.5/site-packages/tox/session.py", line 38, in main
    config = prepare(args)
  File "/Users/whit537/personal/AspenWeb/aspen.py/env/lib/python3.5/site-packages/tox/session.py", line 26, in prepare
    config = parseconfig(args)
  File "/Users/whit537/personal/AspenWeb/aspen.py/env/lib/python3.5/site-packages/tox/config.py", line 229, in parseconfig
    parseini(config, inipath)
  File "/Users/whit537/personal/AspenWeb/aspen.py/env/lib/python3.5/site-packages/tox/config.py", line 644, in __init__
    self._cfg = py.iniconfig.IniConfig(config.toxinipath)
  File "/Users/whit537/personal/AspenWeb/aspen.py/env/lib/python3.5/site-packages/py/_iniconfig.py", line 71, in __init__
    self._raise(lineno, 'duplicate name %r'%(name, ))
  File "/Users/whit537/personal/AspenWeb/aspen.py/env/lib/python3.5/site-packages/py/_iniconfig.py", line 75, in _raise
    raise ParseError(self.path, lineno, msg)
py._iniconfig.ParseError: /Users/whit537/personal/AspenWeb/aspen.py/tox.ini:6: duplicate name 'deps'
```

### Notes

I also tried using a single deps key like so:

```
deps=-rrequirements.txt -rrequirements_tests.txt
```

and:

```
deps=-rrequirements.txt,-rrequirements_tests.txt
```