Create an RPM for slider

Create an RPM for slider if the app is built on a linux VM with the rpmtools package installed.

This will

1. install slider somewhere (where?). Maybe /usr/local/slider
2. set up the env var to /etc/hadoop/slider (and do what with it?).
3. add slider/bin to the path.

Simple first edition would require the config to be in /usr/local/slider/conf and do nothing about the env vars