Fix: atom-racer does not need to create temporary files #76
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atom-racer creates temporary files to provide completion even for unsafed content.
This results in a lot of writes to the disk and is unnecessary. The racer command allows to
pass a subsitute file whose content will be used instead of the file completion is invoked for (its location is used nevertheless).
Instead of specifying a real substitute file '-' is passed and the contents are read from stdin.
This also removes the 'temp' dependency.