Hold wake lock when servald is running
Always notify completion

In some cases, completion were not notified, so the caller can wait the
result forever.
Merge pull request #83 from rom1v/completion

Always notify completion
Replace wifi signal strength images
Revise network layout
Increase number of bytes of key displayed
Fix display of toasts on some platforms
Don't dismiss immediately on completing adhoc test
Sync serval-dna
Move wifi status text to string resources
Fix hotspot control

- Fix bug with detecting state on android 4.0+
- Correctly notice when android has turned it off
- Give up after 20 seconds with no progress
Serve web pages from assets folder
Show the correct IP address for sharing via wifi client networks
Refactor audio handling in preparation for more reuse and more codecs
Clean up unused jni code
Initial import of codec2 source code
More audio path refactoring to support codec2
Add native jni interface for codec2
Compile opus codec
Process multiple blocks of audio if they can be recorded quickly