added TODO's for bfmPixel()
removed 'export(hdf2ndv)' from NAMESPACE because of error message when installing package:
Error in namespaceExport(ns, exports) : undefined exports: hdf2ndvi
Merge branch 'fix-NAMESPACE' into develop

merge fix-NAMESPACE
bfmPixel() changed to use window() and only subset on pixel time series (rather than using dropLayer)
added TODO's to bfmSpatial()
finished editing bfmSpatial() to subset at pixel level (rather than entire raster)
Merge branch 'feature-bfm_window' into develop

merge feature-bfm_window into develop
changed all ind returned by band names as character, instead of band numbers
Finished feature implementation; no validation yet
Tiny bug fix, package builds and loads now.
Validation of tiff feature successful on 2 datasets. One hdf ordered on earth explorer only containing the sr bands and a geotiff (usgs test datasets), containing the already pre-processed Indices. IMO the filenames structure will change a little and I may have to adapt some regex when tiff become available via earthexplorer order
Merge branch 'feature-tiff' into develop
Merge branch 'develop' into vignette
Started working on pre-processing section of the vignette. Still need to add the examples and some more details on data download