Add clippy support

[zhangyaning]

• cita-common-benches
• cita-types
• logger
• panic_hook
• worker
• error
• snappy
• cita-directories
• cita-crypto-trait
• ethcore-bloom-journal
• rlp
• rlp_derive
• authority_manage
• pubsub_rabbitmq
• pubsub_zeromq
• pubsub_kafka
• pubsub
• blake2b
• util
• jsonrpc-types
• cita-web3
• hashable
• cita-merklehash
• db
• cita-secp256k1
• cita-ed25519
• cita-sm2
• cita-crypto
• libproto
• proof
• tx_pool
• jsonrpc-proto
• engine

[Boyu Yang]

I think this issue should be waiting for #179 .

[ka]

I think this issue should be waiting for #179 .

So we can do this issue now?

[Boyu Yang]

I'm afraid not. Life is not perfect, especially rust.

IMHO, since this issue, it is too difficult to add CI, now. (We have to modify the generated codes in build.rs.)

[ka]

I'm afraid not. Life is not perfect, especially rust.

IMHO, since this issue, it is too difficult to add CI, now. (We have to modify the generated codes in build.rs.)

don't understand. does #180 can help?

[ka]

Going to do it first. So i will check the details and get some help form you tomorrow. @yangby-cryptape

[Boyu Yang]

I add clippy to CI (#209) and replace Travis CI by Circle CI (#210) to speed up.
But I skip to lint almost all packages, only keep one as an example.

Next, we can add lint check for each crate, one by one.

[ka]

I add clippy to CI (#209) and replace Travis CI by Circle CI (#210) to speed up.
But I skip to lint almost all packages, only keep one as an example.

Next, we can add lint check for each crate, one by one.

Cool

[ka]

#224