Added features for wrapper:install

Issue

I typically want to install FUSE as a serivce/daemon and use the wrapper:install command to generate the appropriate Jav Service Wrapper components. After they are generated, I typically have to go and edit the wrapper.conf file. I would like to request the following to make it so the editing is not required.

1) Specify environment variable and values. For example I usually add a line to the wrapper.conf like set.JAVA_HOME=/java_root

2) Allow includes to be specified. We have some standard settings that would like included and so put those in a seperate JSW.conf file. We then add the statement #include xxxx.conf in the generated conf file. This also makes for a good way of separating config interests, for example one include config file for JVM settings like garbage collectors.