Slagit

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- Added support for https://overleaf.irisa.fr
- Introduce authentication methods
- https://sharelatex.irisa.fr -- `legacy` authentication method
- https://overleaf.irisa.fr -- `igrida` authentication method
- Overleaf CE (3.0.1) -- `community` authentication method
- Optimize pull/push operation by requesting only file that needs to be updated
(based on time comparisons between your local machine and the remote server)
- Use persitent sessions by default (avoid to log in for every single requests)

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- Cli/clone: Add a check for the base_url format

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- Add version in the user agent

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- Client: (transparent) support for `raweb-latex.inria.fr`
- Misc: Add some functionnal tests

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- Client: add ``new`` method to create a template project
- Client: add ``delete`` method to delete a project
- Client: use a custom user-agent: ``python-sharelatex``
- Cli: expose ``--https-cert-check/--no-https-cert-check`` to control whether ssl verification must be done
- Misc: cleaning and initial functional tests

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- Passwords are now stored in the keyring system