Add notes about Step class lifecycles

[RichardBradley]

See http://stackoverflow.com/a/33063300/8261 -- it is not at all obvious that Step classes (or their dependencies) are destroyed and re-created for each Scenario. This doc should hopefully make that clearer.

Since the Steps are destroyed & recreated for each Scenario, it is very important to clean up any resources allocated by them (e.g. database connections) otherwise projects with lots of Scenarios will grind to a halt with resource leaks. However, the Picocontainer lifecycle annotations for this are ignored by cucumber-jvm since it sets NullLifecycleStrategy. I have added documentation here about the simplest workaround (@after annotations, which do work).

HTH

[dkowis]

Merged, as of c0ffacd

[RichardBradley]

@dkowis, as per my comments on #994, the commit c0ffacd is not contained in any public branch of cucumber-jvm, so this hasn't actually been merged yet.

[lock]

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