Allow IPFS server to accept POST requests

Dutch i18n from #5802 for master

Typos in token deploy dapp ui

A CLI flag to allow fast transaction signing when account is unlocked.

* Use randomized subscription ids for PubSub

* Use H64 instead of H128.

* iflet instead of match.

* Adding 0x.

darwin rustup default stable
snap - allow failure

Fixed mem write for empty slice

add --verify
add RUSTFLAGS="-C link-dead-code"

This reverts commit 6b874ced.

switch to RUST 1.18 and NodeJS 8.1

Fix JS tests

* Fix stack display.

* Additional compatiblity fixes.

* Disable UI if it's not compiled in.

* Properly enabled/disable ui server depending on features.

* Require phrase confirmation.

* Linting issues.

* Fix dialog title.

* Confirm a backup phrase.

* Confirm recovery phrase on fist run as well.

* Duration limit made optional for EthashParams

* Forgotten space added

* Update changelog for 1.6.8

* Add more changelog details for 1.6.8

* Fix date

* Replace ethcore in terms and conditions

* Replace ethcore company name in various places

* Fix casing in t&c