Java 7u60 release

Remove apt from java alternatives.

It is deprecated and conflicts with Debian apt package.

Closes #16

Java 7u55 release

Java 7u51 release

Fix prepare.sh on older git versions

Java 7u45 release

Closes #13

Java 7u40 release

Closes #11

Java 7u25 release

Java 7u21 release

Java 7u17 release