Introduction of ConsoleCommandExtension in order to decouple io.console
and the script engine

Signed-off-by: Oliver Libutzki <o.libutzki@external.telekom.de>
Added headers / Removed import package versions

Signed-off-by: Oliver Libutzki <o.libutzki@external.telekom.de>
org.eclipse.osgi.framework.console changed to optional
Downgrade to OSGi Spec 4.2

Signed-off-by: Oliver Libutzki <o.libutzki@external.telekom.de>
Merge pull request #12 from qivicon/consoleinterpreterextension

Introduction of ConsoleCommandExtension in order to decouple io.console and the script engine