Adding Hadoop MR VertexScanJob support
Adding titan-hadoop back into titan-all
Updating TP3 version to 3.0.0.M6
Adding imports to Gremlin plugin
Delete Rexster-related comment in titan-all pom
Make titan-all use Hadoop 1 by default

This commit switches titan-all from a Hadoop 2 dependency to a Hadoop
1 dependency.  The downstream user can still override this with
dependency exclusions.  The point of this change is to make titan-all
play nicely with TP3 in the default configuration (since TP3 uses
Hadoop 1).
Make Gremlin plugin dir = package, tidy up imports
Changing more titan-all deps to Hadoop 1

Cutting Solr (Hadoop 2) from titan-all and replacing hbase-client 0.98
dep with a hbase 0.94 dep
Merge branch 'titan09' of github.com:thinkaurelius/titan into titan09
Adding titan-doc module

This is a subset of the functionality in the old titan-dist module.  A
bunch of titan-dist stuff is still broken from the move to TP3, but
the AsciiDoc->DocBook->HTML toolchain stuff can be easily extracted
into a separate module ("titan-doc").
Merge branch 'titan09' of github.com:thinkaurelius/titan into titan09