Multi-module phoenix to support hadoop1 and hadoop2.

Allow build-time selection of supporting hadoop1 or hadoop2. 

This setup is almost exactly what HBase uses (and it works pretty well). For right now, we just publish artifacts against hadoop1 (similar to hbase 0.94 series). Later we can make it work with different names for the different versions supported.

Check jars/tar by hand - looks ok to me (but I'm not an expert in everything we need).

To import into eclipse, remove phoenix project. Then import as maven project into eclipse (same as in build.txt - no need to do maven eclipse:eclipse).