Add node_modules to gitignore
Add node_modules to gitignore

with the integration of karma a package.json will be introduced and
the node_modules directory with the libs

openspending/spendb,spendb/spendb,pudo/spendb,johnjohndoe/spendb,spendb/spendb,spendb/spendb,johnjohndoe/spendb,CivicVision/datahub,pudo/spendb,openspending/spendb,johnjohndoe/spendb,CivicVision/datahub,pudo/spendb,openspending/spendb,CivicVision/datahub