Merge pull request #66 from jamesyothers/master

changed order of message and time of message on chats
Store time of appointment as UTC String
(fix) passes: Fix drop down box
Merge pull request #67 from alexanderGugel/fix/filter

(fix) passes: Fix drop down box
Merge branch 'dateTime'
Merge pull request #68 from smk1992/master

Store Time as UTC time
(fix) Don't display invalid src-URL
(fix) Display placeholder avatar if not available
Merge pull request #69 from alexanderGugel/fix/avatars

Fix/avatars
added url to whitelist for iOS
add logo, change color of top bars, reroute signout to signin