exp/template: make Set.MustParse* methods return the set. This brings them into line with the Template.MustParse* methods and makes it possible to use them in global variable initializations.
exp/template: make Set.MustParse* methods return the set.
This brings them into line with the Template.MustParse* methods
and makes it possible to use them in global variable initializations.

R=r
CC=golang-dev
http://codereview.appspot.com/4798059

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang