shortened by moving stuff to Annex, added References.
Merge branch 'master' of https://github.com/nmrML/nmrML
Merge branch 'master' of https://github.com/nmrML/nmrML
new figures, added 3rd example (HOP)
refromatted references
corrected PM of UOXF to .8
bruker example for the reference spectra of 2-ketobutyric acid
Merge branch 'master' into develop
new classes from model, probably from previous update to the xsd