bipy/app/test/test_util.py references /tmp, and general clean-up to temp file naming in app controllers

[gregcaporaso]

All references to /tmp should be replaced with tempfile.tempdir.

We also really need to re-do the get_tmp_filename function/method to better use of python's tempfile module. One way to do that that might be relatively painless would be to keep the interface of that function/method the same, but internally use the tempfile module. Thoughts on that? Note that cogent.app.util.get_tmp_filename is very widely used in QIIME, though it falls low in my list because it's imported in qiime.util, where some QIIME-specific defaults (e.g., temp_dir=get_qiime_temp_dir()) are set, and then imported from there.

[Jorge-C]

We also need to replace the teardown_module function in bipy/app/tests/test_util.py with more fine grained teardown methods in the classes that need it.

[jairideout]

Closing as the application controller code is now in burrito. Opened an issue there to keep track of this.