Add bin/update options for no-dev deps, and no git updates

Summary: - Add bin/update options `--no-dev` and `--no-git`

Test Plan:
Run `bin/update`
Run `bin/update --no-git` and check it skips git pull etc
Run `bin/update --no-dev` and check it skip dev dependencies

Reviewers: lkamau, shadowhand

Reviewed By: shadowhand

Differential Revision: https://phabricator.ushahidi.com/D257