Got rid of Maven Shade Plugin wherever it was possible.

Artefacts which still have need to use the plugin:

    - cucumber-groovy
    - cucumber-jython
    - cucumber-jruby
Explanatory comments added

Included some comments in the Groovy example to help those coming to
Cucumber-JVM and Groovy from other similar development environments,
e.g. Behave and Python.
Merge pull request #522 from ffbit/get-rid-of-shade-plugin

Got rid of Maven Shade Plugin wherever it was possible.
Annotating change from the pull request
Merge pull request #537 from quantoid/master

Explanatory comments added to Groovy example
Noting updated examples