Updates to interface

• Remove underscore methods from OnlineStatsBase interface.

Lots of bug fixes

• mainly stuff for JuliaDB integration

Minor updates

• bug fixes

Minor update

• Bug fixes
• More tests
• Change representation of CountMap

ScalarOb -> Any

• Anything not in an AbstractArray, Tuple, or NamedTuple is considered to be "one thing"
• bug fixes

AbstractSeries and More

• AbstractSeries and AugmentedSeries for filtering/transforming input.
• IndexedPartition for partitioning over an index variable.
• Plot recipes for Partition types

Add Partition and Group

plus some bug fixes.

OnlineStats: Christmas Eve Version

• simplified handling of weights
• reorganized histogram code
• add Partition
• bug fixes and more tests

Various updates

PQuantile and more

Updated show method and small bug fixes

v0.13.1

change show to use ascii box-drawing