&&修复CANavigationBar 更新背景Image的bug
&&优化CASwitch体验
&&修复CATableView与CACollectionView设置选中项的bug
&&修复 CASlider 与 CSegmentedControl释放崩溃的bug
Update README.md
Update README.md

Add 'recent controls writing plan', 'existed controls missing features' English version description.
CrossApp alpha 0.1.4 Update (English Version)

CrossApp alpha 0.1.4 Update: Power Consumption Optimization, CAButton Modification, CASchedule and Demo Location Change
CrossApp alpha 0.1.5 Update (English version)

CrossApp alpha 0.1.5 Update (English version): Add CASwitch, Touch event dispatch rules modification, GPS location function and others
Update README.md
CrossApp alpha 0.1.6 Update (English version)

CrossApp alpha 0.1.6 Update: Add CASlider, CASegmentedControl. Touch event dispatch rules optimization, add CAResponder class, CATextField functions completion and others.
CrossApp alpha 0.1.7 Update (English version)
Update README.md
CrossApp alpha 0.1.8 Update (English version)

CrossApp alpha 0.1.8 Update
CrossApp alpha 0.1.9 Update (English version)

CrossApp alpha 0.1.9 Update
CrossApp alpha 0.1.10 Update (English version)

CrossApp alpha 0.1.10 Update
CrossApp alpha 0.1.11 Update: (Important changes)

CrossApp alpha 0.1.11 Update
CrossApp beta 0.2.0 Update: (Important changes)

CrossApp beta 0.2.0 Update
CrossApp beta 0.2.1 Update

CrossApp beta 0.2.1 Update
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Merge commit 'f5f1af72d3c893b4519b750f2d51b4c3e075a4f8' into branch_Liyuanfeng