Merge tag '1.3.3' into develop

v1.3.3

- Fix: browsermob-proxy now runs inside a Composer vendor/ folder
- Fix: remove debugging output from selenium-server.sh script
Update dependencies.json to support multiple platforms
Add chromedriver downloads for i386 and darwin
Merge branch 'develop' of github.com:datasift/php_webdriver into develop
version bump
Merge branch 'release/1.3.4'