[DBAL-461] Add support for NUMERIC(N, M) type syntax in SQL Server.
Merge branch 'DBAL-461'
[DBAL-452] Add RANGE keyword to MySQL and Oracle reserved keywords lists.
Merge branch 'DBAL-452'
fix platform create constraint foreign table name quotation
fix AbstractPlatformTestCase namespace usage
Merge pull request #287 from deeky666/fix-create-constraint-quotation

Fix platform create constraint foreign table name quotation
Added column collation support  for MySQL, SQLite and PostgreSQL
Fixed calculation of differences of columns