v0.6.0-M5

• Adds expect.same for equality comparisons
• Removes the need to ascribe types in Checkers (scalacheck)
• Removes simpleTest as it overlaps with one of the test overloads
• Removes Expectations => F[Expectations] implicit conversion as it was leading users to use expectations in for-comprehensions, when in fact that had no effect, thus breaking principle of least surprise
• Adds a construct for resource memoisation, that users can use (optionally) to share constructs between suites a bit more efficiently