mssql drop forein key added to query builder
added dropPrimaryKey
cleaning load table schema
Revert "Create DatePickerAsset.php"

This reverts commit 8e9d1f9ec33596c748b34654f75d240fcfd0b876.
cleaning findTableNames
cleaned up as much as i understood in schema
adopted renameColumn stored procedure
alter column rewrite
added rename table
Merge branch 'mssql'