Fixes .war file creation

Msfvenom was creating invalid executables for War file creation.
The jsp template file used Runtime.getRuntime(<String>) which causes the execution to fail in windows where the path includes a space character. This is due to security updates in Java 7u21 (thanks @shierlm)

[FixRM #8717]
[FixRM #8724]

```
[*] Meterpreter session 2 opened (192.168.1.22:4444 -> 192.168.1.117:63345) at 2013-12-22 21:05:16 +0000

meterpreter > pwd
C:\Users\Ben\Desktop\New folder\apache-tomcat-8.0.0-RC5\bin
```