Update README.md

Minor syntactical changes made.
Update README.md

Radio button code edited
Update README.md

How to install by using source code
Removed an unnecessary line of code

When we resignFirstResponder, UIKeyboardWillHideNotification is called. If someone does a custom thing when the keyboard becomes hidden it brings problems. When we remove this line, it won't do any harm.

What do you think?
Update RETableViewOptionsController.h
Update RETableViewOptionsController.m
handle selected item
Fix RETableViewBoolCell constraints on iOS 8

On iOS 8 UIKit adds own constraints to contentView, so removing all
contentView’s constraints causes problems when the cell
is displayed for the second time on the screen.
Fix RETableViewSegmentedCell constraints on iOS 8

On iOS 8 UIKit adds own constraints to contentView, so removing all
contentView’s constraints causes problems when the cell
is displayed for the second time on the screen.
Merge pull request #178 from fastred/master

Fix RETableViewBoolCell's and RETableViewSegmentedCell's layout on iOS 8
Merge pull request #151 from bhavya-kothari/master

Minor changes to README.md
Merge pull request #173 from unixo/master

RETableViewOptionsController current selection
Update RETableViewBoolCell.m
Update RETableViewLongTextCell.m
Merge pull request #185 from srea/update_longtextcell

Fix RETableViewLongTextCell constraints on iOS 8
Merge pull request #183 from skrew/master

Update RETableViewBoolCell.m
Tweak example project
Version bump (1.5.12)
Update pods
Merge pull request #171 from tasomaniac/patch-1

Removed resignFirstResponder, as becomeFirstResponder is called right after it anyway.