Fix zoom center issue #281

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thelittlefireman wants to merge 6 commits intoalamkanak:developfrom

thelittlefireman:fix_zoom_center_issue

Commits on Feb 1, 2016

Clean Code (refractor move --> interfaces)
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Commits on Feb 4, 2016

Commits on Feb 8, 2016

Clean Code (refractor move --> interfaces) part 4 (Merge with develop Branch)
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Commits on Feb 11, 2016

Merge branch 'develop' of https://github.com/alamkanak/Android-Week-View into develop
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Fix bad zoom : Zoom is now centers where you start the zoom (from the middle of the tow fingers)
thelittlefireman
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