add galpy paper to list of pubs, some further tweaks, fixes #227 [ci skip]
add galpy paper to list of pubs, some further tweaks, fixes #227 [ci skip]

followthesheep/galpy,jobovy/galpy,jobovy/galpy,followthesheep/galpy,jobovy/galpy,jobovy/galpy,followthesheep/galpy,followthesheep/galpy