FXFormFieldViewController should allow instance

Fix #94
Update FXForms.m
Ignore standard @properties of NSObject
An empty text value submitted for a field of type NSNumber is now treated as nil instead of zero
Updated to version 1.2
Use UITableViewAutomaticDimension for header/footer heights
Merge pull request #194 from jhersh/master

Use UITableViewAutomaticDimension for header/footer heights
Updated to version 1.2.1
Fixed unit tests
Fixed default values crash
UIKIT_EXTERN for great justice + typos
Merge pull request #196 from jhersh/master

UIKIT_EXTERN for great justice + typos
Updated to version 1.2.2
Updated to version 1.2.3
Merge pull request #113 from wimbledon/patch-2

FXFormFieldViewController should allow instance
Fixed build failed.
Merge pull request #204 from qfish/master

A hotfix for build error .
Updated to version 1.2.4
fix crash with string field footer
Merge pull request #214 from hanneskaeufler/hk-fix-footer

fix crash with string field footer