Remove verb-specific handler methods from Server

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Implement OnSpawn

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Implement OnLs

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Implement OnStart and OnStop

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Implement OnGet

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Implement OnAttach

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Implement OnLog and OnError

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Convert aggregate and orchard to new server DSL

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Merge pull request #95 from aanand/server-dsl