Fix check for sessionStorage support

On Safari < 10 private mode, sessionStorage is also not available and will thrown QuotaExceededError if accessed

implement safe $apply

only trigger digest cycle if not already in one

minify the fixes

0.3.13

update minified file

fix silly typo

0.3.12

fix typo

fix issue in storage event handler

0.3.11

properly update version

0.3.10

fix issue with undefined keys when storage is empty

0.3.8.1

fixes bower.json for the forked repo

0.3.8

adds immediate write of changes on page unload