OpenAeroStruct v.2.8.0

What's Changed

• Make geometry spline interpolation mesh independent by @A-CGray in #435
• Move CI to Azure by @A-CGray in #438

#435 changes the way design variables are interpolated along the span of the wing which may change your analysis and optimization results, especially if you use a non-uniform spanwise mesh distribution.

Full Changelog: v2.7.3...v.2.8.0