Add links to the source code and issues pages.
Add up navigation to alarm list.
Extract navigation handling in helper method.
SSL cert check fix. Use Subject CN if not SubjectAltNames are present, fallback to android trust manager

Fixes "domain names do not match" error message when CACert root certificate is
installed in android settings
Merge pull request #17 from johnjohndoe/feature/links-for-source-code-and-issues

Add links to the source code and issues pages.
Merge branch 'master' of github.com:tuxmobil/CampFahrplan
Merge pull request #18 from johnjohndoe/feature/up-navigation-for-alarm-list

Up navigation for alarm list