Added fvcom.grid class
Added method to create new FVCOM grid
Added interpolation code to fvcom.grid
Added plotting code to fvcom.grid class
Began merging PDD plot into fvcom.grid class
Added is.in.grid, find.elem to fvcom.grid
Added projection for xlim and ylim in pddFVCOMGrid
Merged jet and bathy colors into single color ramps file.
Continuted debugging PDD
Debugged PDD plot
Added initial plot function
Added projection code to pdd