Merge pull request #1 from juharris/master

tagger: thread safety + training: Ability to set parameters
Merge pull request #2 from juharris/master

Version 0.3: handling feature scaling in training and testing + unit tests
Use .dylib extension for Mac OS X libraries.

System.mapLibraryName() uses the .jnilib extension on Java 6, but .dylib
on Java 7 and up.
Bump the version to 0.4.