Adding `TabIndex` and `AutoFocus`.

Should address #75 and #74
Added overloads to Humanizer.Register to support all Humanizer letter casings. Did not break existing API.
Merge pull request #80 from TravisTheTechie/master

Adding `TabIndex` and `AutoFocus`.
Merge pull request #81 from mwhelan/master

Overloads for HumanizedLabels.Register to support all Humanizer letter casings