Merge pull request #76 from LuisFF/master

bruker example for the reference spectra of 2-ketobutyric acid
A first rough draft of an NMR-ML Specification document. This version with comments and in very drafty stage. All text blocs from the original mzML Doc that can stay as they are are highlighted in yellow,  the rest has been aligned for nmrML mainly by adding text form the D2.4 deliverable.
Merge pull request #77 from LuisFF/master

nmrML example for bmse000325 NMR experiment
pynmrML
Updated nmrML.py
Modifications to spec doc
Added xerces xsd validation errors as comments. Added further comments based on a meeting with our nmr expert.