Update Rails to 4.1 #23

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PavloKovalov wants to merge 13 commits intomasterfrom

Commits on Apr 13, 2014

assign users
roleme
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Commits on Apr 15, 2014

Update assign user to project
PavloKovalov
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Commits on Apr 16, 2014

Commits on Apr 17, 2014

Add validation for Task due_date
PavloKovalov
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