Support for RuntimeOptions.merge and multiple @CucumberOptions

[dimgit]

Currently, the expectation is that there may be only one class annotated with CucumberOptions.
This is a bit limiting - specifically, with Android and running from Eclipse, there is not a good way to specify alternative options, without changing the ones already defined. This is needed in cases where a developer may want to use specific options while working on a task, for example, without modifying the project default CucumberOptions.

The suggestion here is to support multiple classes annotated with CucumberOptions. Then, all of them are merged, in order. This will also require ability to specify CucumberOptions merge order.

Merging here means overwrite the option if it already exists (was specified previously).

[klausbayrhammer]

Currently you can use multiple RuntimeOptions, but only when the annotated classes are inherited (see #568). But I do like the idea of "merging" RuntimeOptions by a specified merge order (since the solution in #568 has no explicit merge strategy for boolean-attributes).

[brasmusson]

Currently there is an inconsistency with respect to how the option types that can have multiple value (tags, features, glue) are "merged" when defined in more than one place.
@CucumberOptions(features = "dir1") + -Dcucumber.options="dir2" result in that the features option are set to "dir2".
@CucumberOptions(features = "dir1") in super class + @CucumberOptions(features = "dir2") in sub class result in that the features options are set to "dir1 dir2".
I read "Merging here means overwrite the option if it already exists (was specified previously)" in this pull request description, as it is the @CucumberOptions(features = "dir1") + -Dcucumber.options="dir2" behavior we want.
This issue surfaced in #622, when duplicate glue paths were defined when the runner class had a super class which were in the same package.

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