Adds samples for Java and Scala

A demo of the Java wrapper for OpenCV with two examples: 1) feature detection and matching and 2) face detection. The examples are coded in Scala and Java.

To run the examples:
1) Install OpenCV and copy the OpenCV jar to lib/. This jar must match the native libraries installed in your system. If this isn't the case, you may get a java.lang.UnsatisfiedLinkError at runtime.

3) Go to the root directory and type "sbt/sbt run". This should generate images in your current directory.