pyspark addition to compute layer and tests
join operation on pyspark rdds
.travis.yml installs spark
- separate out RDD join
- increase clarity of test cases
Merge pull request #1 from mrocklin/pyspark2

Pyspark2
groupby/join for spark added
wget for travis
using Spark source and not pre-built binary
handle some spark serialization issues

1.  itertools.tee doesn't serialize well
2.  pre-resolve the dispatched compute function
Merge pull request #2 from mrocklin/pyspark3

handle some spark serialization issues
Merge branch 'reorg' of github.com:ContinuumIO/blaze into pyspark
spark: compute on ResultIterable
Fix crazy serialization issue with spark and platform

https://issues.apache.org/jira/browse/SPARK-1394
Merge pull request #3 from mrocklin/pyspark4

Pyspark4
spark: explicitly reify spark group before call to apply
Merge pull request #4 from mrocklin/pyspark5

Pyspark5
remove dshape keyword from CSV
CSV schema discovery
discovery: hints for csv
SQLAlchemy table datashape discovery
SQL datashape discovery