Added tests cases for no semi-colon terminating a SuperSimple expression
Added support for iterating the model directly in SuperSimple
Added an HtmlEncode method. It performs a single pass through the input string to do the encoding and also copies the string to a char[] so that it can index in to it without doing additional string allocations.
To begin with this is hooked in to the process with a simple bool on WriteExpression, later consideration will be given to making this a pluggable helper system.