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This commit adds the --format tag to all of the autocompletion functions. The default format changed from json to a "human readable" format as of version 0.10.  This change should be backward compatible.  Alternatively, these commands could be simplified by using the new default human readable format.

* Enhanced gradle plugin to parse tasks from a quick execution of the tool
* Added a duplicated function for gradlew completion that uses gradlew internally. Builds like Gradle itself (built with Gradle) are sensitive to being run with a matching gradlew version.
* Fixed broken caching of gradle task names. Added - and -- argument completions.

svn:external set and the output of 'svn status' returned the check for
the external. E.g.

$ svn st
X       Application

Performing status on external item at 'Application'

Shouldn't be marked as being dirty. By grepping for only the valid
output for what should be class as dirty, it won't return false
positives.