Successfully parsing all DefinitelyTyped typescript definition files

Addresses the following:

* Hex and octal escaped characters in Typescript string literals are now parsed, in addition to the Unicode escaping
* Typescript identifiers that begin with a typescript keyword (e.g. anyDB) are now correctly parsed
* Import declarations of form ```import <identifier> = <entity name>``` are now correctly parsed
* Compiler now ignores type imports that result in identity after calculating entity names ( for an example of when this can occur, see [insight.d.ts](https://github.com/ca-ta/DefinitelyTyped/blob/master/insight/insight.d.ts)). Not doing so results in infinite recursion when trying to resolve the types.

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A bunch of assemblies for which compilation fails still exists. There seem to be multiple reasons and  I have yet to identify them all. 
However, one issue seems to be that there are modules and types with the same name (see, for example, ```interface Data``` in [vega.d.ts](https://github.com/ca-ta/DefinitelyTyped/blob/master/vega/vega.d.ts)). In my F# projects I typically use ```[<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]``` to work around this F# limitation - I am thinking that applying the same technique to the Funscript F# file generator could work. What do you think?

I read your mentioning of re-introducing the type provider - could you point me to the source code for it? Do you see a future to the current assembly generator or are you planning to replace it? (I'm probably misunderstanding something :-) )

Thanks for Funscript!