Slight schema change
Base migration now actually executes create table commands through DAL
Migration system additions
CLEAN - Some clarification comments to Column base class
FIX - Migration class now properly checks for DBNull if no migrations have been run
FIX - Migration class now uses proper filtering for classes that extend BaseMigration (doesn't include BaseMigration now)
FIX - Corrected stack overflow from recursive ColumnTypeString() [more caffeine required]
FIX - Migration system now includes data type sizes for column definitions in CREATE TABLE
DEV - Added PrimaryKeyInt column type to migration system