Define labels and rules for Trilinos application issues and metrics

Created by: ibaned

Please see the discussion between https://github.com/trilinos/Trilinos/issues/1304#issuecomment-329885910 and https://github.com/trilinos/Trilinos/issues/1304#issuecomment-329918877 where I propose the following:

create a few extra issues labels besides "bug", namely "compile error (Trilinos)", "compile error (application)", "compile warning (Trilinos)", "compile warning (application)", "test failure (Trilinos)", "test failure (application)". Then we can collect statistics on how many issues with each label were opened in a particular period of time. I would also expand "(Trilinos)" to be either "(Trilinos/develop)" or "(Trilinos/master)"

Note @bartlettroscoe 's observation:

before we define any more labels I think we need to better organize them along the lines of #1619.

@maherou @jwillenbring