Purge web directory and everything HTML, refs T985

Summary:
- remove `web/`
- remove npm, bower, and bundle files
- reduce all exceptions to JSON
- purge HTML stuff (layouts, etc)

Test Plan:
```
bin/behat --config application/tests/behat.yml -f progress
```

Reviewers: aMoniker, vladimir

Subscribers: spaudanjo, srutto, rjmackay

Differential Revision: https://phabricator.ushahidi.com/D457
update travis config
fix bin/update