Add missing Selenium browsers in Citrus integration

**User story**
As a citrus test developer, I want to be able to use all Browsers provided by selenium in my citrus test cases, so that I'm able to use all browsers to test my application.

**Additional context**
Derived from #495.
Additional refinement required.
It is currently possible to use all web drivers by using the `custom` browser type as described in the [selenium browser documentation](http://citrusframework.org/citrus/reference/html/index.html#selenium-browser). So this enhancement would be, more or less, syntactic sugar.