Github-backup

-------------------

Fix
~~~
- Properly import version from github_backup package. [Jose Diaz-
Gonzalez]
- Support alternate git status output. [Jose Diaz-Gonzalez]

Other
~~~~~
- Pep8: E501 line too long (83 > 79 characters) [Jose Diaz-Gonzalez]
- Pep8: E128 continuation line under-indented for visual indent. [Jose
Diaz-Gonzalez]
- Support archivization using bare git clones. [Andrzej Maczuga]
- Fix typo, 3x. [Terrell Russell]

-------------------
- Support --token file:///home/user/token.txt (fixes gh-51) [Björn
Dahlgren]
- Fix some linting. [Albert Wang]
- Fix byte/string conversion for python 3. [Albert Wang]
- Support python 3. [Albert Wang]
- Encode special characters in password. [Remi Rampin]
- Don't pretend program name is "Github Backup" [Remi Rampin]
- Don't install over insecure connection. [Remi Rampin]

The git:// protocol is unauthenticated and unencrypted, and no longer advertised by GitHub. Using HTTPS shouldn't impact performance.

-------------------
- Fixes 29. [Jonas Michel]

Reporting an error when the user's rate limit is exceeded causes
the script to terminate after resuming execution from a rate limit
sleep. Instead of generating an explicit error we just want to
inform the user that the script is going to sleep until their rate
limit count resets.
- Fixes 29. [Jonas Michel]

The errors list was not being cleared out after resuming a backup
from a rate limit sleep. When the backup was resumed, the non-empty
errors list caused the backup to quit after the next `retrieve_data`
request.

-------------------
- Add a note regarding git version requirement. [Jose Diaz-Gonzalez]

Closes 37

-------------------
- Implement incremental updates. [Robert Bradshaw]

Guarded with an --incremental flag.

Stores the time of the last update and only downloads issue and
pull request data since this time. All other data is relatively
small (likely fetched with a single request) and so is simply
re-populated from scratch as before.

------------------
- Fix cloning private repos with basic auth or token. [Kazuki Suda]