Updated PhantomJSDriver and Selenium versions. Minor bugfixes and improvements included.

Following dependencies have been updated:

• Selenium version is now 3.4.0
• PhantomJSDriver version is now 1.4.2

Also following bugfixes and improvements are included:

• #885 Fix NPE when platform is unknown
• #882 Make it possible to override getDriver()
• #893 Prevent NPE if getCapabilities() is null
• #896 Allow nulling the driver after a test
• #897 Fix invalid main class name in manifest
• #907 Allowing @RunLocally to use Edge and IE
• #909 Allow test to be run in a hub with system property
• #905 License checker should respect log level when printing messages
• #895 Automatically scroll elements into view before interacting with them
• #883 Add helper for executing JavaScript