start adding popup window for prices
add checking of app code
refactor popup window
add background for popup, rate button;

  make popup show when version changes
add facebook button to popup
add click effect to rate/fb buttons
small refactoring
add rate button into help
add mail_send image button
add intents to run FB page
change popup background
prettify poput
cleanup strings
fix Help layout
Merge branch 'add_popup_window'