Support memory footprint requirement in spec

[nitsanw]

This is following input from V.Klang (TypeSafe) and P.Ron(P.Universe) where a requirement for a concurrent queue is expressed such that queue memory footprint is minimal even at the risk of false sharing. For JAQ queues we are err in the side of padding, so perhaps have 4 settings: MIN/LOW/HIGH/MAX
In the case of bounded impls this would translate into:
MIN-> no padding
LOW-> pad between P/C fields
HIGH-> pad pre/post class + between P/C fields
MAX-> pad pre/post class + pre/post array + between P/C fields

[nitsanw]

This relies on code generation as described in #9

[nitsanw]

Spec is deprecated due to lack of interest