User-agent

Changed

Changed
* Use InvalidOption exception instead of UserAgentRuntimeError and UserAgentInvalidRequirements

Changed
- Update mobile device IDs

Added
- The `ua` script for generating user-agent data in console
- Add product, productSub, vendor, buildID features
- New OS: android
- Add new option `device_type`
- If no os given then device type is "desktop" by default
- Add smartphone and tablet device IDs
- Add chrome and android navigators for android OS

Changed
- Rename `platform` option to `os` option

Fixed
- Better validation platform/navigator options
- Fix bugs in appVersion feature

Added
- Extend CI test environments: py35, py36, Windows.

Changed
- Add recent chrome and firefox versions, by pawelmhm
- Add recent Mac OS releases, by pawelmhm
- Remove deprecated chrome/firefox versions

Fixed
- Fix bug in generating chrome user agent on mac platform, by pawelmhm

Changed
- Add recent chrome and firefox versions, by pawelmhm