Introduction of a new "About application" page

+ version number from Manifest
+ urls for license, list of changes, support
+ based on concepts as found in https://github.com/schildbach/bitcoin-wallet
+ theme-aware page (dark/light design)
+ returns correctly from web pages (like source code, support forum) to the About page
+ (C) 2014 Open Whisper Systems
+ obeying code style guidelines
Add time to messages when they are within the week

//FREEBIE
Introduction of a new "About application" page

+ version number from Manifest
+ urls for license, list of changes, support
+ based on concepts as found in https://github.com/schildbach/bitcoin-wallet
+ theme-aware page (dark/light design)
+ returns correctly from web pages (like source code, support forum) to the About page
+ (C) 2014 Open Whisper Systems
+ obeying code style guidelines
Always allow resend in Conversation details menu
Removed the word "at" in message details timestamp

- to avoid the need of i10n/i18n
Add possibility to delete contact's identity and directory entry

This solves #274 and could be a way to remedy #791 (deleting the wrong number from the directory, adding the next one on the next sync)
deletekey - also when a session still exists
added "not connected to a google account" to registration problems list
Merge branch 'about-application-screen' into develop

+ re-added the History-of-changes (new Url)