Version 0.0.1

Major changes
- Add openstack client command
- Add support for access token instead of refresh token. Now users can choose
    whether to use access token or refresh token
- Rename package to egi-fedcloud-client
- Rename CLI command to fedcloud
- Add command "token check" for checking validity of access token
- Split list-vos to separate command "token list-vos" from "token refresh"
- Split functionalities to frontend and backend function. Backend functions have no output
except for returned values, and so can be used as libraries for other projects

Minor changes
- Refactoring checkin.py and endpoint.py

Version 0.0.2
- Add sites.py read site info from github
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