ARQGRA-345: GrapheneElement can not be used as @Root - fixed

* GrapheneElement can be now used as field type for Page Fragment @Root
* It required couple of refactorins: I had to extract interface from
  GrapheneElement, because proxy which is created for it needs that
  interface in the list of interfaces which it should implement
* I had to rename the implementation to GrapheneElementImpl
* GrapheneElement is wrapped element, I had to add to the
  WrapperEnricher conditional code which would take into account the
  GrapheneElement - it is ugly bit imo only only solution right now
ARQGRA-391: introduced SPI annotation @ImplementedBy accompanited by TypeResolver#instantiate(type)
ARQGRA-345: use ImplementedBy on GrapheneElement to determine final implementation
ARQGRA-345: completing docs + renaming tests appropriately
ARQGRA-379: upgrade Drone to 1.2.0.CR2
ARQGRA-379: upgrade Drone to 1.2.0.Final
[maven-release-plugin] prepare release 2.0.0.CR2
[maven-release-plugin] prepare for next development iteration
added buildhive-settings
adding CONTRIBUTING.md
updating README.md
[maven-release-plugin] prepare release 2.0.0.Final
[maven-release-plugin] prepare for next development iteration
README: Clarified instructions for running integration tests
ARQGRA-414: fix a few tests failing with Safari
Added support for host (Win/IE ActiveXObject) objects
added test module for ActiveXObjects
added test for borrowing of setTimeout method from Function.prototype
ARQGRA-397: support for ActiveX objects (IE9 and lower)
ARQGRA-413: making GrapheneElement working with @InFrame

* GrepheneElement added to the set which contains classes to not enrich
  further, when they are annotated with @InFrame annotation
* I chose this way of determination, because we can not say to the
  future that all interfaces will be ignored, as we are planning to
  enable programming to an interface, not an implementation.
* At the same time we do not want to enrich further some custom
  implementations: e.g. org.openqa.selenium.support.ui.Select