GEOMESA 320, use apache commons csv

* replaced usage of javacsv with 1.0 release of apache commons csv in geomesa-tools
* updated test to ensure wkt still works with commons csv
* updated pom
GEOMESA-330 Avro SimpleFeature's getProperty should return a Property even when the value is null

This addresses an issue found by a user who was attempting to run the Quick Start tutorial.
GEOMESA-328 Fix IndexIterator exception
 * The fix is from @anthony-ccri.
 * The tests show the exceptions which we observed on tablet servers.
GEOMESA-132 Create a branch that is compatible with Accumulo 1.5 and Hadoop 2.0 (instead of 2.2)

In addition to down-grading the version of Hadoop, this commit
also uses gt-epsg-wkt in lieu of gt-epsg-hsql, and relies on
Scala 2.10.3.

NB:  To test, this build was installed on a VM that used
Hadoop 2.0.x and Accumulo 1.5.x.  The quick-start tutorial
worked as expected, including visualization through
GeoServer.
GEOMESA-300 change artifact names in hadoop 2.0 branch