Handle connection error and show message in textview

* No status code was being returned earlier in case of a connection
  error
Whitespace fixes, retabs
Better layout for userdb activity

* Removed constants
* Used relative layouts for horizontal alignment
Merge branch 'button_design' to add bigger buttons

Added bigger, easily accesible buttons
Buttons are:
* OUT: Logout button shown in red
* IN: Login button shown in green
* WEB: Opens Web Browser
Added overall padding, relative padding, moved Manage User

* Moved save and manage user together
* Removed Launch Browser Button
* overall padding of 10dp
* relative padding for different horizontal components
New version release updates v0.5.0