core, core/vm, tests: changed the initialisation behaviour of the EVM

This commit serves as a temporary workaround for enabling the jit until
the block customisation PR is merged in.

Implemented the following block debugging RPC calls

* Block(RLP)
* BlockByFile(fileName)
* BlockByNumber(number)
* BlockByHash(hash)

The EVM is now initialised with an additional configured object that
allows you to turn on debugging options.

Strip extraneous carriage return from end of entered password

rpc/http: improve request handling

The EVM was previously initialised and created for every CALL, CALLCODE,
DELEGATECALL and CREATE. This PR changes this behaviour so that the same
EVM can be used through the session and beyond as long as the
Environment sticks around.

accounts/abi: Fixed bytes input accept []byte and variable input support

eth, miner: fetch pending block/state in on go (data race)

accounts/abi: handle the "constant" modifier for functions

core: fixed various typos

core, eth: replace reorganiz with reorganis

core: various typos

eth: various typos

Fixed up `[]byte` slice support such that `function print(bytes input)`
accepts `[]byte` as input and treats it as 1 element rather than a slice
of multiple elements.

Added support for variable length input parameters like `bytes` and
`strings`.

cmd/utils, internal/debug: fixes for debugging

templates: added issue template

p2p/nat: fix #2291, NAT discovery did't abort on failure

Go 1.6 only prints stacks for the current goroutine by default,
but for this panic we want to see all of them.

Setting runtime.MemProfileRate to 0 through the flag default
value makes it impossible to get an 'in-use' profile.

core: added future proc mutex lock

core: cache fresh headers and tds to avoid db trashing

Added a future lock which prevents the anything being added or removed
from or to the set when looping over the set of blocks. This fixes a nil
pointer in the range loop when trying to retrieve a block from the set
which was previously available but removed due to regular chain
processing.

Fixes #2305

Godeps: pull in the leveldb upstream write race fix

eth/downloader: fix a throughput estimation data race

core: create a header chain structure shared by full and light clients