RISE Wallet 1.2 Beta 2

RISE Wallet 1.2 Beta 2, available for the following platforms:

• Web
• Windows
• Linux
• MacOS

Notes:

• on Windows and MacOS High Sierra there's two windows (one console) #175
• web version has to be served from an HTTPS web server with the content of the archive available in the root dir

Changes since 1.1.3:

• switched to the webusb transport for Ledger Nano (fixes #224)