Add unit test for mysql5 to ensure case changes result in a rename
When diffing mysql5 columns or with quoted column names, consider a change in column name case to be a rename
Add unit test to ensure pgsql8 column name case changes are handled correctly
In pgsql8, do nothing when renaming without quoting, do a rename when quoting, throw when renaming without an oldColumnName
Merge branch 'dev-column-case-change'

This addresses issues regarding case changes in column names between database
versions. In MySQL, DBSteward now considers *any* change in case to be a
renamed column. In PgSQL, following the SQL standard, case is only considered
when column quoting is turned on. In either case, if DBSteward detects a
column name case change and it would consider it a rename, but there is no
oldColumnName that explicitly marks it as such, DBSteward will error out.