tif_discretize: Read tif file and discretize values
In tereom/bnecology: What the Package Does (One Line, Title Case)

Recieves a path to a tif, reads the raster, crops and sets to given extent, discretizes values and writes a new raster with the same name in given path

1	tif_discretize(tif_path, breaks = 4, extent, path_save, vals_na = -1)

`tif_path`	path to tif file that will be read and discretized
`breaks`	number of breaks passed to arules::discretize
`extent`	extent to which raster will be cropped and set
`path_save`	path to new file, where the discretized raster will be
`vals_na`	values to be set to NA saved