Update README.textile

With a raw checkout, people need to build the thing.  I realize there is more to do here, the maven build just creates an installer?  The suggestion here is that it would be nice to clone the repo and have all the instructions necessary to build and run to get it running quickly from source.

So it could go something like this:

Configure the install package type that will be built: how to set buidl of tar vs deb installer?
Build using Maven: Run @mvn clean package -DskipTests@
     Note: you will need java jdk 1.7 or greater and JAVA_HOME defined.
Find the installer package and run: .... 
cd [intstall location] 
untar -tvf blah.tar.gz
Change to the installation: cd blah

then the rest...