update version strings to 0.4.2-dev
fix incorrect propagation of dtype in Series normalize and other methods
Replace hyphen with underscore
Merge remote-tracking branch 'upstream/0.4.x' into 0.4.x
move apply method up to Data from Images and Series; __finalize__ method docstring changes
specify float64 output from Series correlate
enforce float-valued Series data, remove casting in Series operations
update test expectations for new Series data types
cast series binary data to float on loading; prevent series cast to int via astype
remove cast to float on writing series binary data, remove check against explicit casting series to non-float
fix SeriesLoader data type handling; add data type assertions to tests
Changed set call for backwards compatibility
Merge pull request #46 from industrial-sloth/0.4.x

fix incorrect propagation of dtype in Series normalize and other methods
[THUNDER-48] Explicitly specify Hadoop dependency

While the build instructions for the scala code are not yet explicit, sbt does a bit of magic to pull the Hadoop version from Spark, which defaults to 1.0.4 at the moment.  This change at least makes the version explicit, so the user can know to change it if desired.

Fixes #48 (kinda)
Add repartition method to Data
merge Series data type changes from 0.4.x
Merge pull request #49 from laserson/THUNDER-48

[THUNDER-48] Explicitly specify Hadoop dependency
remove PIL, add Pillow in ec2 init script
spatial smoothing functions added

both Gaussian and Median filtering options added to eliminate background noise from erratically behaving voxels
Updated the thunder-ec2 script to support starting and stopping of clusters.  This allows cluster state to persist between uses (at the small cost of paying for the EBS storage space you use).