add current_locus method to crispr to return current crispr locus object for crispr, also added helper methods to return coordinates for a crispr
fix issue with returning right or left crispr locus for a crispr pair, we must be sure to get locus record on the right assembly. Replaced relationship with a method to return the right locus. Also added helper methods to return crispr pair coordinates
deal with crisprs or crispr pairs, add pod documentation
Merge branch 'crispr_qc' of github.com:htgt/LIMS2-WebApp into crispr_qc