Skip writable checks on output
created an override option for the default sequence file link, also removed some unnecessary mustBeWritable checks
Refactored MetadataWriter into separate class
Merged rlau changes with MetadataWriter changes
Addressed code review comments
Small refactoring of an Option in MetadataWriter
Removed MetadataWriter from job run
Merge master into SkipWritableChecks and make Metadata a callback
Fixed merge issue
Merge pull request #6 from ibuenros/2014/08/20/buenrostro/SkipWritableChecks

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