Squash all Network Speed indicator changes

Thanks to:

- Der-Schubi
- paour

Which includes:

-Fixed (hopefully) traffic meter by received bytes by time elapsed rat…
…her than fixed value

commit: https://github.com/temasek/android_frameworks_base/commit/655b50fbf7a916127430af724cfb017a06aeed89

-Update Traffic.java

commit: https://github.com/temasek/android_frameworks_base/commit/d49c1000cccaa9363d620ec7df9fb6c456df3b9e

-TrafficStats exposes only static methods, no need to instantiate it

commit: https://github.com/temasek/android_frameworks_base/commit/7aac56573d7a90bd38427ec85a08218a60f94e6e

-Update Traffic.java

commit: https://github.com/temasek/android_frameworks_base/commit/e4f8d62108356c737326ecb24d6f6a2ff4c435b0

-Fixed divide by zero error, improve display of slow speeds

commit: https://github.com/temasek/android_frameworks_base/commit/2d806bc0f3268c4460c945285432945903c7ed11

-Partial rewrite of traffic indicator

commit: https://github.com/temasek/android_frameworks_base/commit/d93b67b7524d2344690a6829cf766a899505d825

-Traffic meter: show summary of traffic in brackets

commit: https://github.com/temasek/android_frameworks_base/commit/c44b9cae48bf53b98dab70ce6d84d8395ffe89ed