daemon: Remove managed network option

Now the daemon assumes it is unconnected until an interface is defined with
Internet access.
android-daemon: Configuration option "net_managed" removed
recipes: add "global" option to uci configuration in openwrt
Merge pull request #99 from morgenroth/Refactored-global-option

Refactored global option
daemon: Remove duplicate dependency in debian control file
android-daemon: Add hint to install flex and bison tools for building
daemon: Fix typo in comment
daemon: Code-style typo
Merge pull request #100 from morgenroth/Minor-fixes

Minor fixes
daemon: Fix session clean-up of key-exchange

Prior this patch the default bab key is deleted during the session is cleaned.
Merge pull request #101 from morgenroth/Fix-session-cleanup-in-keyexchange

daemon: Fix session clean-up of key-exchange
android-api: Unregister routine fixed and permission strings added to Intent class
android-api: New DTNIntentService class added

This implementation of an IntentService avoids locking of the main thread
during the registration procedure.
android-daemon: Send broadcast intents only to App with the right permission
android-daemon: Hide ugly error message during session termination
DTNExampleApp: Use new DTNIntentService for all DTN operations

Additionally, a menu item is added to perform a deregistration.
Whisper: Add debug menu item for deregistration
Whisper: Use new DTNIntentService for all DTN operations
Talkie: Use new DTNIntentService for all DTN operations
ShareBox: Use new DTNIntentService for all DTN operations