Allow classes inside functions

[ComFreek]

ES 6 allows class expressions inside functions (source 1, source 2 (first comment)).

Suggestion: TypeScript should allow classes inside functions.

function test() { 
   // Throws "Unexpected token; 'statement' expected." 
   class ABC { 
   } 
}

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Original CodePlex issue: http://typescript.codeplex.com/workitem/136

[sophiajt]

Thanks for the suggestion. There's a bug tracking ES6 class expressions work (#239) and has some of the design notes if you want to comment.