Refreshing / Loading records when viewing a Metric sheet locks up UI

[Glavin001]

/cc @toddmurphy

[Glavin001]

• Show "Loading..." for fields initially until load has completed
• Check if value is nil or "" (empty string) and if so, set to "No description for Asset", etc

[Glavin001]

This should help with loading Asset performance: Streamlyne/Cocoa-SDK#15
but only on the second read.. there are still many other optimizations to do!

[Glavin001]

When loading:

[Glavin001]

Another necessary issue: Streamlyne/Cocoa-SDK#17

[Glavin001]

And Streamlyne/Cocoa-SDK#18

[Glavin001]

This is the true issue and solution!
Using Background Fetching With Core Data: http://www.sebastianrehnby.com/blog/2013/05/20/using-background-fetching-with-core-data/

Using Time Profiler I see

[Glavin001]

Another, UI Freeze with Magical Record: http://stackoverflow.com/a/13060226

[Glavin001]

Common save patterns for use with MagicalRecord: https://gist.github.com/tonyarnold/4694673