Bugfix in timestamp.java#23

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Commits on Aug 2, 2017

fixed a bug in the timestamp function. the ts function would return `false` if applied to any triple that would contain a literal as object which was not a string. this is now fixed.
schlevik
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Commits on Aug 8, 2017

Changed the grammar to accept multi-character time units (such as ms).
schlevik
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