apps.jsfiledownload: Removed.

Not in use as far as I can tell. See #630.
Removed devilry/apps/developertools/management/commands/dev_jsduck.py.

Not in use. See #630.
Removed devilry/apps/developertools/management/commands/dev_autogen_extjsmodels.py.

Not in use. See #630.
Removed devilry.apps.extjshelpers from INSTALLED_APPS.

Not in use. See #630.
Removed devilry.apps.extjshelpers.

Not in use. See #630.
Removed apps/markup/static/extjs_classes/markup/MarkdownFullEditor.js.

Not in use. See #630.
devilry_theme2: Updated bower components.

Fixes #633.