Allow {apply, {M, F, A}} in static subscribers list

The result of apply(M,F,A) must be a list of legal subscriber
tuples (including possibly {apply, {M,F,A}}.
Added {select, Expr} pattern for predefined subscriptions.

Also, added a start phase for predefined reporters.
The reporters must start *after* the predefined entries have
been registered, in order to avoid a race condition.
Merge pull request #38 from Feuerlabs/uw-dynamic-subscribers

Allow {apply, {M, F, A}} in static subscribers list