Add correlate method to series
Add test for single set of indices
Add generic constructor
Add filter methods
Simplify normalize call to avoid function def
Removed auxiliary function for querying
Fixed bug in propagating attributes
Abs -> clipping for RGB data
Expose colorize in top-level API
Simplify function def
Add colorize to docs
Clean up
Fixed option in test
Merge pull request #35 from industrial-sloth/custom-rdds

Custom rdds: image stacks to series conversion
Expose keytype and valuetype to context
Convert keys to ints for binary
Assume casting of keys to ints in test
Replace example iris data

- Including both binary and test format examples
- Also include conf file
Use new files when loading example data
Add example tif stack data