Correct Json mapping for Angular and Radial Axis Styles

[FlippievanDyk]

Corrects json representation of AngularAxis styles

• direction
  • uses setValueOptBy for Direction, to map the DU
• rotation
• period
• tickVals
• tickFormat
• tickText

closes #251

[FlippievanDyk]

I am by no means an expert on Plotly, but it appears all the json keys are completely lower case, at least for the styles.
I think I got everything, only found issues in the Polar folder, however, it may be possible to just put a String.toLower function inline, to ensure this cannot cause a bug? The problem with that is the extra function call, so I think that is why it isn't like that already.

Wither way, I think those I have changed are trivial.