Adding test for #835

This fails under Hadoop 1 (but not 2) due to the bug reported in #835.
Fix up next.
Put context.getConfiguration calls behind compat

Converting calls to getConfiguration() on Hadoop Context instances to
DEFAULT_COMPAT.getContextConfiguration(<instance>).  Fixes #835.
Update old RDF config value in example Hadoop props

The config value "n-triples" in rdf-input.properties should have been
N_TRIPLES.
Adding test for #786

This test runs in the aurelius-release profile.  I implemented it as
an Expect-based integration test in titan-dist because that was the
most straightward approach within the existing test harness that
allowed for restarting the JVM in the middle of the test logic, which
is necessary to catch a regression on this particular bug.