urlmon: When detecting text/html look for HEAD or BODY tags too and only in first 256 bytes

[Paul Chitescu]

Changelog:
	urlmon: When detecting text/html look for HEAD or BODY tags too and only in 
first 256 bytes

This fixes bug #27115 and similar.

Note that this is just a minor improvement. The entire implementation should 
be changed to follow the IE way:
http://msdn.microsoft.com/en-us/library/ms775147(v=vs.85).aspx

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