Added support for oauth2-password-flow (refactored #1574)#1853

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frol wants to merge 1 commit intoswagger-api:masterfrom frol:feature/oauth2-password-flow

+167-99

Commits on Jan 6, 2016

Merged @pusherman PR swagger-api#1574 with the latest master changes and added a heap of fixes on top of that
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