Fix Java.JDK Chocolatey Installer

The current installer on chocolatey for Java.JDK is broken due to a typeo. After fixing that I added a few more changes that I thought would be helpful.

* Fix cmd call wrapper typeo
* Detect 64-bit OS even when running via 32-bit powershell executable
* Add param for forcing 32-bit install on a 64-bit OS
* Add param for installation directory
* Install latest jdk version (7u45)

The new installation parameters can be used by passing -params '"x64=false;path=c:\\path\\to\\jdk"'.