Added some documentation
Correct _grid_file name

Change-Id: If0ec28a7bbb4fbdf603613006f0c8da114c77886
Merge branch 'master' of https://github.com/remyvb/ora_rac into remyvb-master

Conflicts:
	manifests/base.pp
	manifests/ensure_oracle_ownership.pp
	manifests/os.pp
	manifests/swapspace.pp
Merge branch 'remyvb-master'