Allow arbitrary method calls in yield expressions
Allow arbitrary method calls in yield expressions

Fixes bug 612172.

spidermonkdust/vala,frida/vala,frida/vala,jessevdk/vala,rvu95/vala,severinh/vala,Distrotech/vala,rvu95/vala,Distrotech/vala,tjol/vala-tjol,tjol/vala-tjol,severinh/vala,severinh/vala,jessevdk/vala,kamanashisroy/aroop,frida/vala,spidermonkdust/vala,GNOME/vala,frida/vala,flobrosch/vala-fixes,kamanashisroy/aroop,rvu95/vala,xdave/pvala,Distrotech/vala,frida/vala,flobrosch/vala-fixes,GNOME/vala,kamanashisroy/aroop,spidermonkdust/vala,jessevdk/vala,playya/vala,GNOME/vala,playya/vala,playya/vala,GNOME/vala,tjol/vala-tjol,flobrosch/vala-fixes