Show floatingLabel for case that field's value that has alreay been set

Sometimes field has alreay binded a value, in this case, we should allow
it to show the floatingLabel by sending [self setNeedsLayout].
Merge pull request #20 from iOSLabs/master

Show floatingLabel for case that field's value that has alreay been set
syntax cleanup
update podspec 0.0.3