Fluidsf

Substantial update to FluidSF

1. Renamed to FluidSF
2. Support for 1D and 3D data
3. Compute 2D maps of SFs
4. Blended SFs (e.g. LTT, LSS)
5. Binning
6. Full and comprehensive documentation: https://cassidymwagner.github.io/fluidsf/

Works in progress
* Improved suite of tests
* Latitude-longitude support (see 29 for progress)

**Full Changelog**: https://github.com/cassidymwagner/fluidsf/commits/v0.2.0

First release for oceans_sf, a package designed to calculate structure functions from ocean surface velocity and tracer data.

1. Calculates new advective structure functions -- velocity and scalar
2. Calculates traditional n-th order structure functions -- velocity and scalar
3. Calculates structure functions in x and y directions (meridional and zonal, or along- and across-track)
4. Supports data with periodic and non-periodic boundary conditions, even and uneven grids, and 2D satellite swath data.

Works in progress
* Comprehensive testing
* Full documentation including docstring and example use-cases

**Full Changelog**: https://github.com/cassidymwagner/oceans_sf/commits/v0.1.0