Make all communication async.

[Georgi87]

I just adapted my application to work asynchronously using callbacks. The DAPP is way more responsive now. But it still lags sometimes. It could be due to the sha3 calls that are made for every request to get function signatures.

[kumavis]

web3 uses a lot of synchronous rpc calls internally for some reason. This has caused endless performance problems for me as well. If we can document the cases, it should be fairly easy to fix them.

[Georgi87]

It seems to me that mostely the sha3 calls are responsible. Why not calculating the hash inside the browser or cache the results for function signatures as they don't change.

[frozeman]

in develop sha3 is already an internal js function. not calling the RPC anymore

[frozeman]

Actually newFilter, which we use internally is also not async.

[frozeman]

Here is a list of functions, which need to be used async internally:

• eth_newFilter
• eth_uninstallFilter

[kumavis]

@frozeman thanks for taking a look into this

[frozeman]

fixed in #230

[kumavis]

yay~