WIP:Feature/612 user account endpoint

[inkhey]

endpoints :

• create user endpoint
• update user email,password, user info
• get user endpoint
• get all user for admin endpoint
• get known user endpoint
• delete user endpoint

others/bugs/etc.. :

• Check need of "transaction.commit() for password modification
• Fix Check correct support of "is_active" of user (access,etc...) tracim#680 issue with is_active

closes tracim/tracim#680

[coveralls]

Pull Request Test Coverage Report for Build 434

• 714 of 730 (97.81%) changed or added relevant lines in 10 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.7%) to 88.133%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tracim/views/core_api/schemas.py	27	28	96.43%
tracim/lib/utils/request.py	2	3	66.67%
tracim/lib/core/user.py	43	45	95.56%
tracim/models/context_models.py	18	24	75.0%
tracim/views/core_api/user_controller.py	112	118	94.92%

Totals
Change from base Build 432:	0.7%
Covered Lines:	9967
Relevant Lines:	11309

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💛 - Coveralls