modified to fix the iOS 7.0 compatibility issue

Since the isConnected method has been deprecated in iOS 7.0, replaced
with the state property

https://developer.apple.com/library/ios/documentation/CoreBluetooth/Refe
rence/CBPeripheral_Class/DeprecationAppendix/AppendixADeprecatedAPI.html
Merge pull request #22 from kotobuki/fixed-the-iOS-7.0-compatibility-issue

Fixed the iOS 7.0 compatibility issue
update changelog
Merge branch 'release/1.0.8'
Fix issue #7
https://github.com/YUKAI/konashi-ios-sdk/issues/7
Merge pull request #25 from 0x0c/fix_picker

Fix issue #7 ActionSheetの表示がおかしい問題を解決
Merge branch 'develop' of https://github.com/YUKAI/konashi-ios-sdk
Merge branch 'master' of github.com:YUKAI/konashi-ios-sdk into ui_category

Conflicts:
	Konashi/Konashi.h
	Konashi/Konashi.m