Performance fix for long documents in 1.2.x branch#577

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mwidner wants to merge 2 commits intoopenannotation:v1.2.xfrom

PoeticMediaLab:long_doc_performance

Commits on Nov 17, 2015

Performance fix for long documents in 1.2.x branch, based off https://github.com/openannotation/xpath-range/pull/9
mwidner
committed

Commits on Nov 19, 2015

Backporting performance improvement in https://github.com/openannotation/annotator/pull/523
mwidner
committed