ENH : added abstract base handler for raw tomographic data
ENH : added TableSource and TableSink ABCs
WIP : hdf based Table handlers
ENH : added product of tig function synthetic data function
BUG : fixed init args on scipy_imread_Handler
BUG : updated examples to use new Distribution* api
ENH : changed examples to use context manager for handlers
EXMP : added an opaquefile example
ENH : made trait mapping more general for integers
STY : cleaned up and documented ImageHistogram
WIP : added more functionality to hdf5 handlers
Merge remote-tracking branch 'github/master'