adjust width for ipad screen

When iPad show splitview,shouldn't use screen width,should use tableview width.
Fix and improve issue #481. Refactor handling of changed values. Add support to fire onValueChanged for controls that have user-change actions like Segmented, Boolean, Date, Multiline, Float & Decimal controls.

The onValueChanged is fired for all the above, but handleEditingChanged for some few.
Nil handling on ticks
Merge branch 'master' of https://github.com/escoz/QuickDialog
Allow section footers to be updated after their initial creation
Updated Podspec to infer git tag from pod version
Merge pull request #523 from Ashton-W/patch-1

Updated Podspec to infer git tag from pod version
Merge pull request #516 from davegurnell/master

Allow section footers to be updated after their creation
Merge pull request #484 from iamdaiyuan/master

Adjust section title width for ipad
renamed a property of QDecimalElement "floatValue" to "numberValue" in compliance with convention
Merge pull request #502 from mamcx/master

Refactor handling of changed values. Add support to fire onValueChanged to the rest of controls
Merge pull request #524 from ddwang/master

changed property name of QDecimalElement from 'floatValue' to 'numberValue'
Change demo code to new number value for  decimal control
Allowing QImageElements to save our their imageValue to an object's UIImage property
Merge pull request #525 from pyro2927/master

Added fetchValueInfoObject: on QImageElement
Merge branch 'master' of github.com:escoz/QuickDialog