Fix issues #276 and #293 by checking for double slashes in STGroupDir #294
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Fixes #276 and fixes #293 by adding or trimming a trailing slash to/from the root and a leading slash to/from the parent before constructing the groupFileURL in STGroupDir.java
Adds unit tests to ensure all 4 combinations of root and parent with or without slash work correctly.
NOTE: This does not remove multiple consecutive leading or trailing slashes like
root//
or//parent
. I feel like supplying such a path counts as user error and is unlikely to occur in practice. If it ever does cause a problem, another issue should be filed.