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Pull #3245

travis-ci

Fixup create command flag application.

Previously StringSlice flag defaults were not respected.  These use
special handling and that handling did not take account of default
values, always over-writing them.  Expand the CommandLine interface to
take advantage of the underlying codegansta/cli.Context IsSet method and
guard default string slice overwrites with an IsSet test.

Signed-off-by: John Sirois <john.sirois@gmail.com>

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