GSD peak picking

Global Spectra Deconvolution for peak picking
Syntax errors fixed

The function findxs is running without errors. But still not giving the
correct answer.
Clean up

.Old code removed.
Add comment
Comentario para miguel
Remove comments
Manual peak picking

GSD implementation for peak picking with working example
Merge pull request #1 from andcastillo/jsNMRGSD

GDS implementation for manual peak picking