Added some functions to make it easy to use#2

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cyndibaby905 wants to merge 8 commits intoraweng:masterfrom

cyndibaby905:master

Commits on Apr 1, 2013

Feature enhancement
Hang Chen
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Feature enhancement
Hang Chen
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Commits on Apr 7, 2013

Commits on Apr 19, 2013

Fully implemented the Gmail loading with four different orientations's animation
cyndibaby905
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Commits on Apr 20, 2013

Code refine. Removed some unnecessary logic
cyndibaby905
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Commits on Jun 10, 2013

Fixed the "jummppy" animation for view exchanging
cyndibaby905
committed