Cylon.py

- Added site config in config.yaml file, example.


sites:
default: http://www.yoursite.com
develop: http://dev.yoursite.com


- Added route config in pageobject file, example.


...
page:
name: home
route: /
...


- Fixed cylon command to run with configure site, example.


cylon run site=develop


- Drop command `cylon run tags <tags>` use `cylon run tags=<tags>` instead.
- Drop support for `site_url:` config in pageobject file.
- Drop support for `settings.yaml` file.

NOTE: Existing projects need to run `cylon update project` command.

- Fixed bug on "move mouse over ..." step.

- Fixed NoneType error on check url keywords.

- Fixed NameError Page on check url keywords.

- Fixed running crash when check element visible.

- Added to check yaml syntax before run.
- Fixed console logs more readable.
- Updated code style follow [PEP8](http://legacy.python.org/dev/peps/pep-0008/).

NOTE: Existing projects need to run `cylon update project` command.