Limit nick length and whitespaces in UI#344

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pastly wants to merge 2 commits intoricochet-im:masterfrom pastly:limit-nick-length

+8-3

Commits on Feb 19, 2016

Limit nick length and whitespaces in ContactUser and UserIdentity
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committed

Commits on Mar 22, 2016

Limit nick length at the UI instead
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committed