Remove deprecations in prep for 2

This removes the old system_* methods in preperation for the 2 release.

Signed-off-by: Ken Barber <ken@bob.sh>
Fix yarddoc for rcp

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #24 from kbarber/remove_deprecations_for_2

Remove deprecations for 2