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