0.2.0

• Introduced assert_that! and assert_pred! macros which panic on failure, acting more like other Rust test libraries.
• Introduced a tuple! matcher macro to match plain (non-struct) tuples by supplying matchers for each entry.
• Modified contains(...).times(...) to take a matcher rather than a plain count as input. Now one can match on containers containing, say, more than a given number of elements meeting the criteria.
• Folded the attribute macro #[google_test_wrapper] into #[google_test].