s/Dark Wallet/Darkwallet/ -> from now on use Darkwallet instead of "Dark Wallet"
Merge pull request #168 from benhc123/patch-2

Added license section
make sure the mnemonic is valid when restoring from seed
Merge pull request #176 from sczi/walletseed

make sure the mnemonic is valid when restoring from seed
Missing braces.
export keys: html.
export keys: seemingly working implementation (not tested!)

Code is based on `signing.js` and is incomplete (cannot select which
keys to export).

Upon successful password entry, the keys are displayed in

<address>,<private exponent>

form in the "tools" output box in the middle of the screen, one key per
line. All keys in the extension store are exported, including "pocket"
ones.
export keys: test unit skeleton (copied from `signingSpec.js`)