First pass at sorting on data for series, #127
Continued work on #127
Sorted -> Sort names, for #127
Fixed sorted -> sort in tests for #127
Altered ? accessor behavior for ObjectSeries, for #133
Fix error with #133 implementation
Addresses #136
Addresses #137, preserves column keys even when no remaining rows
Address #138 - R interop on frames
Working on fixing appendN
Removed extra code
Move a couple other functions over to appendN
Figured out the linq expression for #139
Fix one demo, copy paste doc comment
Merge pull request #145 from tpetricek/mainline

Fix one demo, copy paste doc comment
Merge pull request #135 from BlueMountainCapital/mainline

This includes the sort functionality, and the different ObjectSeries ? behavior