Importing the nzem module will now automatically apply the masks to DataFrames and Series
Fixed typo
Added a reduced average function

This function takes a series, sorts the data and then applies a reducing
aggregation to the data.
This reducing aggregation takes ever decreasing increments and is intended to
assess whether single data points are skewing the aggregation. I.e. they are not
distributed evenly and extremes dominate.
Fixed minor bug, offset by 1 in the creation of an arange object
Created a single point version of the sorted reduction in a series of data.

Similar to the multi point approximation but works on percentages as a convenience.
Added support for 0 percentages to point reduction
Docstrings for the two new functions
Added sample count function