Make AngularTemplateCompile also use a persistent worker. (#117)
Make AngularTemplateCompile also use a persistent worker. (#117)

This brings down compilation time of editing
src/hello-world/hello-world.component.ts from 3.8s to 1.2s on my
machine.
angular/angular-bazel-example,angular/angular-bazel-example,angular/angular-bazel-example,angular/angular-bazel-example