* change gas cost for contract creating txs
* invalidate signature with s value greater than secp256k1 N / 2
* OOG contract creation if not enough gas to store code
* new difficulty adjustment algorithm
* new DELEGATECALL op code

Godeps: update all dependencies

accounts/abi: support for typed array

Added support for fixed size and arbitrary length byte arrays to be
marshallable in fixed size (typed) byte slices.

eth/filters: ✨ pending logs ✨

cmd, common, node, rpc: move HTTP RPC into node, drop singleton aspect

Pending logs are now filterable through the Go API. Filter API changed
such that each filter type has it's own bucket and adding filter
explicitly requires you specify the bucket to put it in.

This was requested by some users earlier but liner didn't support
it at the time. It does now.

Fixing the filename matters now because it will actually show
up in JS backtraces.

account/abi, vm/runtime: abi fixes & simplified runtime calling mechanism

Implemented `runtime.Call` which uses - unlike Execute - the given state
for the execution and the address of the contract you wish to execute.
Unlike `Execute`, `Call` requires a config.

Removed old unmarshalling of return types: `abi.Call(...).([]byte)`.
This is now replaced by a new syntax:

```
var a []byte
err := abi.Call(&a, ...)
```

It also addresses a few issues with Bytes and Strings and can also
handle both fixed and arbitrary sized byte slices, including strings.

eth: Added GPO to suggest default gas prices

eth, eth/downloader, jsre: surface state sync progress through the API

This PR fixes a regression of the RPC where the default gas price that
was being used for transaction wasn't properly using the GPO. This PR
adds the GPO back to suggest gas prices rather than the hardcoded
default of 10000000000000.

Closes #2194

eth, miner: move the public miner api into eth to access etherbase

eth/downloader: raise pending state limit that prevented concurrency

eth_sendTransaction, error not reported

eth/filters: added notifications for out of bound log events

Out of Bound log events are events that were removed due to a fork. When
logs are received the filtering mechanism should check for the `removed`
field on the json structure.

cmd/utils: fix jspath flag typo

cmd, common, node, rpc: move IPC into the node itself

rpc: add jsonrpc version to module request, use json types