future plurals
Refactoring brain
Hash#each
Array#delete removes position 0
Array#collects now takes a given attr of an object
Hash#size Number of self keys
Brain interface change

All behaviors are from now own targeted:

    me.brain.activate('seek', other)
    me.brain.is_in$U('seel', other)
    // => true

    me.brain.is_in$U('seek', mom)
    // => false
Brain interface changed

All behaviors are now targeted.

    me.brain.activate('seek', other)
    me.brain.is_in$U('seek', other)
    // => true

    me.brain.is_in$U('seek', mom)
    // => false
Merge branch 'feature/brain' into develop