Disabling ethcore_set* APIs by default (+ Status page update) (#1315)

* More meaningful errors when sending transaction

* Fixing returned value

* Consolidating all RPC error codes

* Fixed loosing peers on incoming connections. (#1293)

* Deactivate peer if it has no new data

* Fixed node table timer registration

* Fixed handshake timeout expiration

* Extra trace

* Fixed session count calculation

* Only deactivate incapable peers in ChainHead state

* Timer registration is not needed

* x64 path

* firewall rules

* Fix read-ahead bug.

Re-ahead 8 bytes rather than 3 to ensure large blocks import fine.

* Refactor to use a const.

* Update README.md

* Gas price statistics. (#1291)

* Gas price statistics.

Affects eth_gasPrice.
Added ethcore_gasPriceStatistics.

Closes #1265

* Fix a bug in eth_gasPrice

* Fix tests.

* Revert minor alteration.

* Tests for gas_price_statistics.

- Tests;
- Additional infrastructure for generating test blocks with
transactions.

* Key load avoid warning (#1303)

* avoid warning with key

* fix intendations

* more intendation fix

* ok() instead of expect()

* Appveyor config for windows build+installer (#1302)

* appveyor

* proper dist name

* quote

* win-build config

* proper build section

* tests in release

* plugin dir

* cache binaries

* quotes

* escaped quotes

* forces user dir

* fixes

* syntax

* proper cahce dir

* quotes?

* root nsis instead of bin

* submodules init

* artifact path fix

* no submodule

* raw link here

* another way to force cargo cache

* include vc++ 2015 redist

* fix name of the dist

* ETHCORE -> Ethcore

* Disabling ethcore_set* APIs (+ Status page)