MODE-2240 Changed FileSystemBinaryStore to retry creating directories when not successful. Only 5 retries will be attempted, and if they all fail the store will throw a meaningful exception. When creating directories for the binaries is successful, there is no change in behavior w/r/t previous code.
Corrected JavaDoc errors/warnings and Java compiler warnings.
Merge pull request #1154 from rhauch/mode-2240

MODE-2240 Changed FileSystemBinaryStore to retry creating directories if not successful