Add 'doc' method to CompanyJedi class.
Add first ugly doc-buffer function.
CompanyJedi doc method return hash instead of list.

Hash has {'short_doc': 'full_doc'} form.
Implement company-jedi-doc-buffer.

Add company-jedi-user-chose function. It get hash value on users
chose of hash key. Hash keys now strings by default.
Add company-jedi-show-doc function.

Viewing documentation at point without company menu.
Add CompanyJedi meta method.
Add emacs client meta function.