Support case-insensitive uniqueness validations under MySQL#39

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dmeranda wants to merge 3 commits intoSchemaPlus:masterfrom

dmeranda:mysql-case-insensitive

Commits on Apr 19, 2016

Fix case-insensitivity uniqueness validation for MySQL.
dmeranda
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Only call the column's case_sensitive? if it is determined by the collation.
dmeranda
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Readme should mention schema_plus_pg_indexes only needed for PostgreSQL.
dmeranda
committed