Fixes #362.
Cleaned up refresh code.
Added a notification to notify the scanner to update itself
  after firing an XMP and after deploying a new resonator.
Fix portal level calculation
Currently, if the average resonator level of a portal is between 0 and 1, the
portal level is incorrectly reading L0.
Merge branch 'refresh_rework' of https://github.com/jbekas/iOS-Ingress into HEAD
Merge branch 'fix_l0' of https://github.com/jbekas/iOS-Ingress into HEAD
Merge branch 'drop_multi' of https://github.com/jbekas/iOS-Ingress into HEAD