accept ssl certs signed by CA
trezor: is_available()
Added blocktrail to explorers
Make all errors for Trezor visible in the GUI
add_cosigner_seed
bugfix
fixes for cosignerpool
move qrscanner from plugins to lib
Merge remote-tracking branch 'upstream/master'

Conflicts:
	gui/qt/main_window.py
	gui/qt/qrtextedit.py
	plugins/qrscanner.py