add upgrading guide for 0.6 -> 0.7
add upgrading guide for 0.6 -> 0.7

JcBernack/endpoints,Dremora/endpoints,endpoints/endpoints,endpoints/endpoints,galenandrew/endpoints,cadorn/endpoints,JcBernack/endpoints,endpoints/endpoints,Dremora/endpoints,Dremora/endpoints,dfd07d/endpoints,dfd07d/endpoints,galenandrew/endpoints,cadorn/endpoints,galenandrew/endpoints,dfd07d/endpoints,cadorn/endpoints,JcBernack/endpoints