- added url for online version of Abelson's book
- added url for online version of Abelson's book

- urls are printed on a separate line


jvican/scala,martijnhoekstra/scala,jvican/scala,lrytz/scala,shimib/scala,felixmulder/scala,jvican/scala,jvican/scala,martijnhoekstra/scala,shimib/scala,slothspot/scala,slothspot/scala,lrytz/scala,scala/scala,felixmulder/scala,lrytz/scala,jvican/scala,slothspot/scala,slothspot/scala,martijnhoekstra/scala,jvican/scala,lrytz/scala,shimib/scala,scala/scala,scala/scala,lrytz/scala,felixmulder/scala,shimib/scala,felixmulder/scala,scala/scala,slothspot/scala,felixmulder/scala,lrytz/scala,felixmulder/scala,felixmulder/scala,scala/scala,shimib/scala,martijnhoekstra/scala,scala/scala,shimib/scala,slothspot/scala,slothspot/scala,martijnhoekstra/scala,jvican/scala,martijnhoekstra/scala