1) Added `ALTextFieldCell`
2) Renamed some constants (`ALTextViewType` enum to `ALTextCellType` enum) to make intention applicable to `UITextView` or `UITextField`-- this isn't a backwards compatible change, but the upgrade path should be minimal.
1) Added delegate calls for `cell:willEndEditing`. This is needed, for example, to allow a controller the chance to make another cell/object the first responder.
2) Added setting placeholder text from `ALTextCellPlaceholderTextKey` to `ALTextFieldCell`
Deleted `AL_refreshPreferredFont` method from `UIView+ALRefreshFont` and updated tests to reflect this.

Unfortunately, this method just wouldn't work correct consistently-- in particular, there's issues with the accessibility font sizes. For this reason, just use `UIFont` method `preferredFontForTextStyle` instead (which *is* always correct).
Missing or invalid `ALTextCellTypeKey` object should *not* configure text view or text field.
Added `IBOutlet` designation to `delegate` properties, to enable setting these in IB.
Fixed bug where `textFieldValueChanged:` wasn't getting called (wrong control event being listened for) on `ALTextFieldCell`
Fixed bug where `textField` was resigning too soon on `ALTextFieldCell`
Fixed broken test in `ALTextFieldCellTests`
Removed `UIView+ALRefreshFont`. Unfortunately, this was a failed attempt because of issues with accessibility sizes.
Major bug fixes:
1) Fixed bug in `UIImageView+ALImageWithURL` where the image was being lost because it wasn't being created from the location until after being dispatched to main
2) Fixed bug in `ALTableViewCellFactory` to allow sizing cells to be created from storyboard dynamic cells (previously, only checked it's `sizingCellDict` set from `init`... now adds new sizing cell if needed from dequeuing from table view.
3) Removed lingering references to `UIView+ALRefreshFont`, which were causing tests not to build

Minor bug fixes:
1) Fixed constraint issues in `ALMenuCell` -- image view height constraints now "optional" but strongly desired (priority == 999)
2) Fixed few broken tests due to multithreading fix related to "Major bug fixes (1)" above

Demo changes:
1) Added `CircularImageView` and custom cell subclass of `ALImageCell` in the storyboard from `TableViewController`
Bug fixes:
1) `UIImageView+ALImageWithURL` -- stop indicator on error, but don't replace placeholder image.
2) `UIImageView+ALImageWithURL` -- got rid of silly `retryCount` method parameter.

Demo changes:
1) Show how placeholder image can easily be set using appearance proxy.
2) Added `maneki_neko` image.
Merge branch 'development' of https://github.com/JRG-Developer/AutoLayoutCells