Only annotate on install instead of on chef run

These changes are necessary to prevent erroneous installation
annotations from being created for users that run chef periodically on
their nodes.  The current recipe creates an annotation on every run,
this change creates an annotation only after bprobe package install.
Converting to old notification syntax

As requested, I've converted the annotations that fire on bprobe package
installation to use the old notification syntax for backwards
compatiblity.
Merge pull request #12 from adamsb6/master

Only annotate on install instead of on chef run