Fix Guide URL parsing error handling
Move ACTION_VIEW handling to separate function

This checks the current site and loads the guide if it is the same as
the requested URL. Still need to handle the other case.
Fix logout finishing Activities

The order needs to be changed so we can compare the previous userid to
the current one. Otherwise it will always be fine.
Guide view intent: Switch sites and load guide
BaseActivity: Save and restore current Site

This is crucial for Intent ACTION guide view because the current site
gets changed without removing all other Activities.
Guide view: Allow lowercase URLs to match filter
BaseActivity.onLogout: Comment permissions check
Merge branch 'master' into action-guide-view-fixes
Merge pull request #120 from iFixit/action-guide-view-fixes

Refactor Guide view intent filtering for Dozuki