NetStats: Use holo_blue_light as color

Change-Id: I9e1b69f694a0d5ba6d90000cab6ada7e8ac63936
NetStats: Option to hide NetStats if there is no traffic

Change-Id: If9626946d31f9a2ac30a3be57a182fb99ef2229f
NetStats: Show "MB/s" instead of only "MB"

Change-Id: I23fa4560a7551495cc4ffa5610c806d4da48f73b
NetStats: Make color settable by user

Change-Id: I9ec49ee9ffe51d07d4930103fa67be2266d41c5c