Stub before/afterSuite and add two failing specs
Implement beforeSuite and afterSuite
Merge branch 'add-before-and-after-suite' of github.com:nottombrown/Quick into nottombrown-add-before-and-after-suite

Conflicts:
	Quick/Core/QuickSpec.m
	QuickTests/Fixtures/Person.swift
World: only run beforeSuite once

- Use dispatch_once to only run beforeSuite closures once.
- Remove afterSuite for now, since it was being run after each spec, not
  during suite teardown.
- Fix logic error in Person fixture.
Example: execute beforeSuite, afterSuite correctly
FunctionalTests: simplify before/after suite tests
README: add before/after suite