Changes to Eclipse project files to make it more generally useable.

* Removed Tomcat 5.5 as a targeted runtime
* Set lib files to non-exported to silence warning in Eclipse Kepler
* Set project encoding to UTF-8 (was inherited from container)
* Set compiler errors/warnings settings (were inherited from container)
* Disabled XML validation to prevent warnings about test data
Closed TokenStream in AbstractSynonymFilter test program.