Merge pull request #7 from swenson/master

Update for Scala 2.10.1, junit 4.11
Merge pull request #9 from swenson/master

Add travis-ci config file
Add travis-ci image
Add support for scalacheck property matchers.
Add README, bump version, bump property matchers into `PropertyMatchers` which extends `Prop`.
Update README, fix StringPropertySpec, don’t make `PropertyMatchers` extend `Prop`.
Move property matchers into matchers/
Bump version to 0.8.1.
Improve handling of errors in ScalaCheck properties.

Before this commit, exceptions thrown in property evaluation would
only show the class and description, but no stack trace. This code
updates the `PropertyMatcher` classes to throw an `AsertionError`
containing the original exception and pretty description of the
property evaluation result if an exception is thrown in either the
property or the generator supplying it.
Don’t return Nil
Add some broken tests
Fix tests.
Fix property exception handling.

This patch updates `PropErrorMatcher.throwIfError` to throw a `RuntimeException` rather than an `AssertionError`. The `AssertionError` causes JUnit to treat the exception as a failed test rather than a test error. This also causes the stack of the `AssertionError` to be printed rather than the stack of the original exception.
Fix notNull matcher; Fixes #13