[Stable] Bind the IPython IE to a fixed Docker Image

Fixes regressions introduced with PR galaxyproject#110.

[STABLE] Job file API fixes

… (exact same functionality here, but it's less chatty this way, since it might not be bound)

[15.03] Check to see if toolshed install is actually bound prior to disposing (e...

This is used by Bioblend, Pulsar, and Planemo and provides several benefits:

 - More flexibility then baking logic directly into .travis.yml
 - Makes the CI testing more portable
 - Generally leads to more parallelism on Travis
 - "prettier" display of results (things are broken down by the kind of test).

For the last two points - compare https://travis-ci.org/galaxyproject/galaxy and https://travis-ci.org/galaxyproject/planemo.

I would like to add the qunit tests to Travis and I see this a good first step toward being able to do that well.

Found bug with tox randomizing Python's hash seed.

Tests are more correct and perhaps less strong as result.

These functions were imported from an external module and contain non-deterministic doctests.

... using unittest2.

... if supplied a short id instead of a GUID and there are multiple versions of a shed tool with the same short id installed.

…downs (BAM files, etc.) to open properly, remove console statement in template

…oad-btn

[STABLE] History UI: in published/annotated panels, fix metafile download drop…

[15.05] Switch Travis testing to tox and associated fixes.

Conflicts:
	config/plugins/interactive_environments/ipython/config/ipython.ini.sample

[15.05] add .tox folder to gitignore

Conflicts:
	config/plugins/visualizations/common/templates/script_entry_point.mako