Completion should generate separate tasks for the root project. #104
Description
Currently the completion for root project tasks are generated like compileJava etc.
Invoking gradle compileJava invokes the compileJava on the root project AND all subprojects that have that task.
I propose to additionally generate completions for :compileJava etc. (i.e. prefixed with :) so the root project's task can be invoked specifically without triggering tasks on subprojects.