Add bin/ushahidi, create oauth commands using symfony/console, fixes T194

Summary:
- install `symfony/console` as a dev dependency
- create `application/classes/Ushahidi/Console` level of classes
- implement "oauth:client" and "oauth:token" commands

Test Plan:
for client:

```
bin/ushahidi oauth:client list
bin/ushahidi oauth:client create
bin/ushahidi oauth:client delete
```

for token:

```
bin/ushahidi oauth:token list
bin/ushahidi oauth:token create
bin/ushahidi oauth:token clean
bin/ushahidi oauth:token delete
```

also try with various combinations of `-u`, `-c`, and `-t`

Reviewers: dkobia, rjmackay, eyedol

Reviewed By: eyedol

Maniphest Tasks: T194

Differential Revision: https://phabricator.ushahidi.com/D92