Update to JUnit 4.11 and Hamcrest 1.3

In addition, removed unreferenced extra JARs
for JMock and ClasspathSuite.
Added example showing mismatch description
Add two slides about FeatureMatchers
Adapt slide to new assertThat() signature
Update mismatch description
Minuses to Dashes
Remove leading whitespace on top of slides
Merge pull request #1 from marcphilipp/hamcrest13-improvements

Hamcrest 1.3 Improvements