test logging in through the API using python with umlauts
use https sources in Gemfiles and also in the documentation (#4109)
include Gemfile.lock to prevent unintended updates (#4174)

We had a broken production server lately because it had upgraded the couchrest model dependency to one that had a different naming scheme for a function we overwrite. So that broke production.
Let's prevent that by including the Gemfile.lock in our repositories.
remove duplicate source line that was using http

I don't think we need to list the sources again in common_dependencies.rb
Merge pull request #104 from azul/test/api-login-with-umlauts-in-password

test login through the API using python with umlauts
Merge remote-tracking branch 'origin/master' into develop
Merge branch 'feature/4109-https-sources' into develop
reset button loading... state on error (#4231)

including test
refactored error display some
no need to create a user for testing failed login attempt
Merge pull request #107 from azul/feature/reenable-submit-button

reset button loading... state on error (#4231)
Fix button to enable account: https://leap.se/code/issues/4246
Version 0.2.6

* reset button state from 'loading...' after failed login attempt
  (#4231)
* use https sources in Gemfiles and documentation(#4109)
* include Gemfile.lock to prevent unintended updates (#4174)
* fixed download urls to get latest versions for mac, android and
  windows
* test api login with umlauts in password