ec2 script changes for spark 1.2.0
allow specifying cluter spark version in ec2 script; some PEP changes
Added seriesMedian() and seriesPercentile() statistics to the series object.
Fixed missing import
set num partitions equal to num images in BotoS3ParallelReader
Fixed minor conflicts
Merge branch 'industrial-sloth-ec2_spark120'
add wildcard handling to BotoS3FileReader
Estimate returns Series without collect
Renaming
Add optional pre filtering

- Uses a setFilter method to add an optional pre filter to a
registration
- Uses the filter to process the reference and the images when
computing transforms, but does not apply the transformation to the
images themselves
workaround to find local example data on ec2 under Spark 1.2
fix bad version comparison when setting PYSPARK_PYTHON in ec2 script
Merge pull request #66 from broxtronix/additional_stats

Added seriesMedian() and seriesPercentile() statistics to the series obj...