ACCUMULO-1796 Document supported Hadoop for binary distro

Signed-off-by: Mike Drob <mdrob@cloudera.com>
Merge branch 1.4.5-SNAP into 1.5.1-SNAP (-sours)
ACCUMULO-2108 set dependency management version for submodules via maven project version.

Signed-off-by: Christopher Tubbs <ctubbsii@apache.org>
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT (-sours)
ACCUMULO-2064 switch to mavanagaiata for sha
Merge branch '1.4.5-SNAPSHOT' into 1.5.1-SNAPSHOT
Merge branch '1.5.1-SNAPSHOT' into 1.6.0-SNAPSHOT
ACCUMULO-1965 Fix exception handling for namespaces

  Make the exception handling propagate correctly to the client.
  Vastly expanded on existing namespace tests to include checks for
  throwing the correct exceptions. Consolidated a lot of the fate
  operations code and refactored the master (slightly; moved inner
  classes to separate files) to be easier to modify the relevant RPC
  handling code.

  Fixed many API bugs related to throwing correct exceptions, found from
  the new tests added to NamespacesIT.