Fail the build if mandatory environment vars are not set.
Use DEV_PARSE_* for debug builds and PARSE_* for release builds.
Merge remote-tracking branch 'upstream/master'
Monkey found a way to open more than one detail fragment. Prevent that.
Optimize GPU overdraw by hiding navigation while occluded.
Sliding fragment callback: disambiguate boolean parameter name.
Don't program in a hurry, you forget things.
Fail differently when Parse.com credentials are missing.

The build failure introduced in 91e259b338809fe2bee10bae37939b879535471b was
tidy, but as it turns out, having the Gradle build fail outright renders
Android Studio unusable, and Android Studio doesn't seem to have a convenient
way to set the build environment. This commit changes things so that the app
gets assembled all right, but crashes hard at startup if the credentials are
not there.
Adds a UI icon for the Bulletin menu item.
Adds a UI icon for the Twitter menu item.
Adds a UI icon for the Newsletter menu item.
Adds a UI icon for the Yurls.net menu item.
Deletes the now-unused "TODO" menu icon.
Adds vertical space between bulletin header and body.
Save analytics events for outside actions.
Update copyright claim.
Extend Holo.Light.DarkActionBar to get the right shade of home-as-up icon.
Merge branch 'master' of github.com:barend/sebastiaanschool
Updated parse lib version.