Added install file, with solution pack install/uninstall hooks.

OnTime: #1415 scholar doesn't install required objects
IslandoraXacml now takes an object as opposed to a pid.
Merge pull request #35 from nigelgbanks/7.x-install-file

Added install file, with solution pack install/uninstall hooks.
Merge pull request #36 from jordandukart/7.x

IslandoraXacml now takes an object as opposed to a pid.