Updated network speed indicator, (1/2):

Additional:
- Traffic summery, (always shown in M-, K-, Bytes, (MB, KB, and B))

Changes:

- Renamed Mb/s, Kb/s and b/s to Mbit/s, Kbit/s and b/s

- (Ported from Cyankang):

    https://github.com/CyanKang/android_frameworks_base/commit/cf109500b506ccefdb1c6c8158c7799097fadad7
    https://github.com/CyanKang/android_frameworks_base/commit/629ab71f89ee6d4692b4598aa7ba5ce6a8ed22cc
    https://github.com/CyanKang/android_frameworks_base/commit/354b26f1fb340fb058877f9b2d7621f24128a7ba
    https://github.com/CyanKang/android_frameworks_base/commit/0d5c07c39321c9f4b91ad135900c341b06f2c2df
    https://github.com/CyanKang/android_frameworks_base/commit/2a729969489027b5c2fae562580200bb8165d592

Change-Id: Ie9cefca1e0b8bee210b92daa388d13721c60a8a7