Create gem structure
Read and write config file
Write assignment to project directory
Update alice's test key
Fetch current assignment from exercism.io
Submit assignment to exercism.io api
Update gemspec
Implement delete on config file
Add CLI wrapper
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Don't cache config file
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Update README
Added approvals to gemspec
Fetch multiple tracks simultaneously
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Implement configuration for project path
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Pass host as command line option

Refactor Api class to be an actual class rather than a collection of
class methods, and pass the host in to it rather than looking it up on
the Exercism class.
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