Exposing application logs via RPC.

Addressing binary serialization for db types

Conflicts:
	rpc/src/v1/tests/ethcore.rs
	rpc/src/v1/traits/ethcore.rs

* removed redundant unwraps

* fixed compilation error, removed warnings

* fixed transaction queue merge conflict

* fixed failing ethminer doc test

fixed transaction queue merge conflict

Configurable limit for transaction queue (CLI & Ethcore-RPC)

Enforce limit caused `last_nonce` to return incorrect values.

Conflicts:
	miner/src/transaction_queue.rs

Conflicts:
	miner/src/transaction_queue.rs

* Even more detailed errors for transaction queue

* Small rename

* Removing macros in favour of functions+try!()

temporary fix of panic in blockchain garbage collection

IPC codegen - some minor fixes & enhancements

Additional logging for transactions

refactored blockchain extras keys building

Using hyper-mio branch in webapps.

Remove nanomsg from build-dependencies