kinvey, Auth cleanup;
create, update property offer; property offer edit in tabs;  

 - removed property.new files and consolidated into property.edit 
 - moved tags instantiation to OfferSchema (was overwriting tags data)
 - added navbar to /properties; /properties/*
 - added [Properties], [New Listing] to navbar
 - icons for navbar links
 - made tags checkbox larger
removed mongoose directives;
"soft" save creates on New prop offer init; properties parent of view/edit;

 - refactored Property/Offer data into PropertyOffer data
   - &rarr; removing Property/Offer Schema factories
 - tab forms alignment
    - &rarr; all forms full width at medium-size device
 - added date available until
 - added ng-flow dep (img upload)

 - moved save/publish buttons to tabs header
 - fancy checkbox style available globally