added conll read/write test.
added unstitch/stitch test
added prepare-tac to combine tac output into new nel eval format
prepare-tac test and sketch for tac eval test
moved annotation classes to annotation file. added annotation reader test.
refactored evaluation to use standoff annotation instead of conll-centric data objects. added tests. renamed conll test data files to differentiate from tac.
added tac evaluation measures. refactored matchers as option to evaluate.
Merge branch 'ceaf' of https://github.com/jnothman/conll03_nel_eval into tac
first cut integrating nil clustering evaluation, needs review and tests.
convert matrix/metrics to save/return (ptp, fp, rtp, fn) tuples. replace and verify pairwise_f1. verify ceaf. add pairwise_f1 and ceaf tests.
move tests from coref_metrics.py to tests.py.
change from generouse to strict p/r
started tac example script. update evaluate to print ptp and rtp. pretty print for json_format.
Fix checking of coreference metrics
Implement Cai and Strube variants
refactored fetch_map. some encoding fixes.
fixed cluster evaluation call
updated eval script to run over all 2013 system outputs for comparison and validation
script to test tac13 scores against official results
renamed run_tac_evaluation.sh to run_tac13_evaluation.sh. some tidying.