Tablesaw version 1.0

[lwhite1]

As Tablesaw is a fully-functional and stable dataframe and visualization library, I've started working on enhancements designed to bring it to a state we could officially call "1.0". As I see them, the major pieces of this effort are:

• Expand coverage of JavaDoc
• Update and expand other Documentation
• Smooth out rough spots in the API, making names more consistent and filling in gaps
• Resolving TODO comments in the code
• Addressing any code marked as @beta
• Continuing to address reported bugs

I may also remove some methods marked as @deprecated as we get closer to 1.0.

In the process I've started using larger "jumps" in the release numbering, as going from 38.5 to 100 (v.1.0) would take about 600 steps. I think the higher numbers also better reflect the state of the system.

Thank you everyone for your many contributions and support of Tablesaw.