SqlServer: Add a test to prove that changing default to null is not working
SqlServer: Fix changing of default value to null
SqlServer: Add tests for creating of columns with various default value types
SqlServer: Add asserts to ensure that defaults are read correctly by getColumns
SqlServer: Parse SQLServer default values to their correct PHP versions
SqlServer: Correctly set default null for null columns on creation
Fix indentation method
Remove php 5.4 short array syntax
Merge pull request #396 from dakota/fix-sql-server-defaults

Fix SQL Server default setting and changing