* prepend className to unique index to allow multiple unique indexes for different classes
* add testcase
* switched test so it can be tested on older versions of parse-server and show failure
* get rid of console log messages on restart by checking if the index exists before creating it
* add IF NOT EXISTS and IF EXISTS to ALTER TABLE
* revert some of code
* ensureIndex use IF NOT EXISTS
* ALTER TABLE CONSTRAINT can't use IF, ADD/DROP COLUMN can
* retesting
* update
* switchted to CREATE UNIQUE INDEX instrad of ALTER TABLE... ALTER TABLE doesn't seem to be needed
de7ec58de3