v1.0.8

Release includes various fixes and improvements to the documentation.

• docs: slimmer environment file for prevent overutilization when building on readthedocs
• docs: updated structure of documentation
• fix: ocean pole tide test read
• fix: verify that input data is a masked array in bilinear interpolate
• fix: masking of netCDF4 ATLAS variables
• fix: place some imports behind try/except to include tools import