async properties

[debris]

added:

• async way of getting properties

removed:

• property setter (it was unused)

[coveralls]

Coverage increased (+0.05%) to 95.12% when pulling cd0df61 on debris:async_properties into 9812b01 on ethereum:develop.

[frozeman]

Though i would habe called it getAsync

[debris]

fixed

[frozeman]

I really like the changes, but i makes myself question the whole use of "properties". Why we don't plainly use:

// sync
var res = web3.eth.blockNumber();

// async
web3.eth.blockNumber(function(e,res) { ... })

You can still use the properties synchronously, but you need to add a (). It at least makes everything more unified. Also in terms of the docs.

[coveralls]

Coverage increased (+0.05%) to 95.12% when pulling 5f9272c on debris:async_properties into 9812b01 on ethereum:develop.

[debris]

but we will break another thing then :) I would prefer to do it later, after merging this pr and releasing new version :)

[frozeman]

ok. lets do it later then. it will anyway be very much recommended to use only async, except you know what you're doing.
so we can later get "rid" of the pure property ones..