Merge pull request #2 from hankhero/master

Fabians changes
added pin encryption with seed as key
Merge branch 'master' of git://github.com/chromaway/cc-wallet-engine
build status of chromaway repo
added missing dependency crypto-js
changes in cc-wallet-core structure
break out AssetTargetModel to own file
fix Wallet export issue for testcases
WalletEngine test now reflects that PIN and passwords are needed
added badge for build and coverage to hankhero