Added approvals to gemspec
Fetch multiple tracks simultaneously
Bump version
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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Add Code Climate badge to readme
Add minitest dependency explicitly
Add travis config
Add travis build badge to readme
Use backwards-compatible File syntax

The `File.write` appears to be a newer introduction. Just open the file
per usual before writing to it.
Replace travis build image
Write absolute path of project dir to config file (Fixes #4)
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Create project dir if it doesn't exist
Bump version
Fix broken path test
SIGINT trapping
Hiding stack traces from end users