Fixed possible model cursor leak

• Fixed a cursor leak when using Postgres and inserting.
• NOT 5.2 compliant

Postgres model insert working

• Fixed model:save() when using Postgres. The 'id' was being set to "NULL" and that violates the primary key constraint.
• NOT 5.2 compliant

Offset Support

• Includes offset support in models.
• Support for HTTP OPTIONS method.
• Still no Lua 5.2 support.