Added can_login Flag for User Login
Added canLogin to User Model
Added Site Environment Name Index Array
Added Environment Properties to anvilSite
Added Database Prefix Support

This allows for a phpAnvil solution to be spread across multiple
databases that can be joined in a single query.
Updated anvilModel formName for database name support.
Fixed path issues by adding a pagePath property.
Added PHP Apache error_log Support

Warnings, errors, and critical are now sent to the built-in error_log
system.
Moved Interface Usage to the Abstract Class.
Changed environment property to an array.

This allows greater flexibility for applications to add custom
environment values for each site.
Added DATA_TYPE_BLOB
Disabled stripslashes for BLOB data fields.

This was corrupting the BLOB data.
Merge remote-tracking branch 'origin/dev'

Conflicts:
	framework/anvilModel.abstract.php
	framework/anvilModelField.class.php