updated polymer references to 0.5.2
small formatting fixes
import roboto font
removed fixed roboto font to use the import.
fab positioning using em units
indentation
added splas text while data is loading
FAB position and animation as Material Design specs, fab hidden than appear
moved fab to 3em for better support on mobile, removed core-scaffold as not used
included maps icons
added paper-icon-button import
updated paper-icon-button code in start.html with the sintax for the latest version of Polymer
replaced the keep icon with a pin as keep does not exist anymore in core-icons
used polymer layout attributes
removed unused CSS for country buttons
updated close buttons with core-icon to be polymer 0.5.2 compliant