Merge pull request qtumproject#339 from qtumproject/earlz/fix-readme

Update readme for post-skynet build instructions

Merge branch 'master' into testnet-2

Merge branch 'master' into testnet-2

* master:
  Optimize loop
  Change loop
  Fix OP_SPEND bug
  Small fix for the Test contract
  Added tests for the EVM's CREATE opcode

Merge pull request qtumproject#281 from qtumproject/master

Master sync

Add smart_contract.png to icons in makefile

Merge pull request qtumproject#199 from qtumproject/neil/fix-vout-ove…

…rflow

Neil/fix vout overflow

Fix regsig checking for subkey sigs in verify-commits

Rebased-From: bbd7579

Fix importmulti returning rescan errors for wrong keys

Bug was a missing ++i line in a new range for loop added in commit e2e2f4c
"Return errors from importmulti if complete rescans are not successful"

Github-Pull: #9829
Rebased-From: 306bd72