Introduced the SkippingException and updated the DotFormatter
Handled display of skipped example in the pretty formatter
Handled display of skipped example in the junit formatter
Handled display of skipped example in the html formatter
Enforced giving a reason to skip an example
Fixed typo in the html report
Fixed cs
Merge pull request #306 from gquemener/skip-example

Added the ability to skip examples
Check that throw-matcher matches all variants
Move scenarios testing "throw" matchers to relevant feature