Add query support to GeoWave data provider

[djohnson729]

In map algebra, when a GeoWave data source is used, allow a query to be included to filter the data that GeoWave reads. The GeoWave api allows the use of Geotools CQL syntax for querying data. Modify the map algebra syntax so that a CQL query can be specified.

For example, assuming that the mrgeo.conf has a GeoWave data source defined named "geowave", and vector data named "roads" has been ingested into GeoWave, filter "roads" to a BBOX AOI and rasterize them to a MrsPyramid:

aoiRoads = [geowave:roads; BBOX(the_geom, -120.0, 20.0, -110.0, 30.0)];
aoiRoadsRaster = RasterizeVector(aoiRoads, "MASK", "12z");

[djohnson729]

Currently, the map/reduce key for vector data is a LongWritable, and the GeoWave record reader assigns that value based on what is returned by SimpleFeature.getID(). It is hard-coded to recognize a string containing one period and the feature id after the period. However, this will not be appropriate for all GeoWave data sources. Look into:

• Seeing if we can set the key to a record number rather than trying to use the feature's id
• Switching the LongWritable map/reduce key to Text (which will be a lot more work)

[djohnson729]

Since the map/reduce key is not used for processing in MrGeo, I hard-coded the key for GeoWave data to -1. This is also what happens in CsvInputFormat.