Added Skills to system

Signed-off-by: Richard Hancock <rjhancock@me.com>
Added Annotate gem

Signed-off-by: Richard Hancock <rjhancock@me.com>
Annotated models

Signed-off-by: Richard Hancock <rjhancock@me.com>
Added serialize for synergy and ability_modifiers

Signed-off-by: Richard Hancock <rjhancock@me.com>
Added skills link

Signed-off-by: Richard Hancock <rjhancock@me.com>