Fix HatBox / PostGIS conflict

[jericks]

GeoScript Groovy can't connect to PostGIS when the new hatbox jar is on the classpath.

https://groups.google.com/forum/#!topic/geoscript/Ff2vqftzhqQ

The error we get is:

java.lang.SecurityException: Prohibited package name: java.sql
at java.lang.ClassLoader.preDefineClass(ClassLoader.java:662)
at java.lang.ClassLoader.defineClass(ClassLoader.java:761)

The solution appears to be removing the hatbox java.sql package and upgrading the java compiler version to 1.6. The interfaces were only there to support java 1.5.

Hatbox Issue:
jodygarnett/hatbox#1

Hatbox Pull Request:
jodygarnett/hatbox#2