Switch to maven?

Hi, I just wanted to let you know I modified your project to just use Maven. I have zero interest in credits for this, all I wanted to do was to find a PCA library that I can use from another maven project.

Nothing major, here's what I did:

* renamed the pca_transform package to com.mkobos.pca_transform (to avoid name conflicts)
* moved the test data csv files in to test/resources
* added a method to DataReader that takes a BufferedReader (rather than an InputStream), and use that from the test method 
* removed the Ant / Ivy files. 

If you are considering switching to maven, you are welcome to pull these changes in and make whatever changes you see fit (in particular, the pom.xml groupId should probably be com.mkobos instead). Or if you prefer to keep using Ivy, that's fine too, just ignore this.