#21 executable jar options

for example:
- for java version check
java -jar denvir-<version>.jar –jvc=<pattern>
pattern like "1.5+" or "1.4"

- for system properties output
java -jar denvir-<version>.jar –sp=<property>
property like "java.version" or "all"

If started without options Denvir should output the
version and help information.