Rename pot2json.py -> po2json.py

The "pot2json" name was misleading; this script is really intended for
use *after* translations have been fleshed out (e.g. when you have a
LANGCODE.po file, for any value of LANGCODE) rather than when you have
an as-yet-untranslated app.pot file. (If the .pot file should be
converted to some other format, that might as well happen inside the
extract-translation-ids.py script, as the .pot file is being created.)
Install SimpleTest via Composer
Update SimpleTest to use JUnit reporter.
Added gulp
Update composer SimpleTest and PHPUnit
wip: add LexUploadCommands
add test images. wip: upload sense image
Add Pictures to config and entries
simplify entry pictures model
re-layout AirBNB style guide
wip: add sense image widget
add delete picture
Lex image upload with tests
fix up file prefix timestamp
separate picture directive and add file upload
add delete for media files
fix images not displaying
fix image upload progress bar
wip: don't add array element before adding picture
Don't add array element before adding picture