Annotation macros

[note]

I created branch macros to which I will be creating next PR's related to reimplementation of Predicates using macros. This PR is mostly for code sharing and discussion - it just reimplements Predicate1 using macro annotation.

@wheaties please take a look, I am really interested what you think about such approach. I slightly changed an API in 3 places - will add a github comments in those lines in a minute.

[wheaties]

This reduces a lot of boilerplate. You intend to have the macro essentially generate all the variants, a la boilerplate.scala?

:+1:

[note]

Yeah, I want to have macro generating all variants of Predicates.

[wheaties]

I should add, that if we ever want to get to that 2.10 cross build (yes, I know, I've been terrible about it) while also introducing macros, we should consider adding macro-compat from Miles Sabin.