Fix index detection for HABTM invoving an STI subclass#78

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RST-J wants to merge 3 commits intoplentz:masterfrom

RST-J:fix_habtm_for_sti_subclass

Commits on Nov 10, 2016

Don't add spaces at the end of BUG messages. Test expected errors precisely.
RST-J
committed
Use ActiveRecord::Reflection::HasAndBelongsToManyReflection#join_table to determine join tables for HABTM associations
RST-J
committed
Make use of #join_table backwards compatible.
RST-J
committed