Fixed bug in single file check when rpath has root folder

[akharit]

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This checklist is used to make sure that common guidelines for a pull request are followed.

Description of the change

• Fixed bug in single file check when rpath has root folder in it for When downloading a directory that actually only has one file buried in it, the directory structure is not maintained #214
• Added Python2 exception compatibility based on FileNotFoundError exception import missing in multithread.py #227

General Guidelines

• The PR has modified HISTORY.rst with an appropriate description of the change and a version increment.
• The PR has supporting test coverage that confirm the expected behavior and protects against regressions, including necessary recordings.
• Links to associated bugs, if any, are in the description.

[coveralls]

Coverage remained the same at 85.606% when pulling 73a8899 on akharit-singleFileFix into e86e1f1 on master.