WIP: Implement environment V2 (closed)

This MR is split into two different one and will be deleted

• allows multiple environments and add environment V2 against /tezos/tezos:master
• switch proto alpha to environment V2 against cryptiumlabs/tezos:proto-proposal

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A new environment (V2) added (#93 (closed)) so that dev can implement all needed changes to the new environment (#37 (closed)).

• correct some harcoded part that tied the shell with first environment (V1)

• new environment (V2), exact copy of first environment (V1)

• The shell accept only protocol on the new environment (V2)

• proto_demo_counter, proto_demo_noops, proto_test_injection are now on the new environment (V2)

• a simple example to protocol signature modification + revert commit; To test/implement a dummy value and have a different signature for protocol on V2. 4175e899

• proto_alpha is now on the new environment (V2)