remove debian directory from master
some corrections to the README file:
* the python-gnutls debian package is not a requirement since it is the wrong version
* python-dev and libgnutls-dev are needed to install the python packages via pip
Merge branch 'feature/fix-crypted-keyring' into develop

This is a temporary workaround until we find a good solution
to issue #744.

Some old versions of python-keyring are causing a recursion loop.
add signal to end of eip checks

this fixes random error on leap initialization
added NEWS.rst and removed notes from README.rst
ping_gateway now uses the provider gateway defined in config file.
stopping openvpn via management interface.
attempts to stop exisiting instances of openvpn when discovered at start up.
added skeleton for generic client wizard flow
moved srp registration to base

and some minor changes in wizard, like textentry for provider.
Merge branch 'feature/detect_and_stop_vpn' into develop
Merge branch 'develop' into feature/generic-wizard
catch cert verification errors and ask user for trust

with a little helper function using gnutls
openvpn commands cleanup
logic for cert validation widgets in wizard
add more digest functions

separate get_cert and get_fingerprint functions
added separator
download ca cert from provider
ca cert fingerprint check + api cert verification
srp authentication class + useful decorator
add bug number in log for #638 cases (domain name mismatch)