the image cropper works well now
the card editor view is refined
even more improvements
set font colors
add some error-handling code
Merge Lei's commit #4

Conflicts:
	iosapp.xcodeproj/project.pbxproj
Merge Lei's commit #4 part 2
Revert "add some error-handling code"

This reverts commit 5f3005ad38cdaf4cf9878219c96fd92d1ec2f6e8.
Revert 882a74f..689bca6

This rolls back to commit 882a74f4fdd9297dc2777bc9e26bbdda5a8aefd0.
Revert 13d82dc..67faecc

This rolls back to commit 13d82dcbef4dc70ef09f694b7ed4cf3d44f6eab3.
Merge Lei's commit #4 part 3