[interfacekit] BAppFileInfo test

Do I remember well ? Was this the test which hanged the registrar ? 
Well, it's working. At least to some extents.

I get these results:
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Results
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- FAILURES: 4
    TestCaller BAppFileInfo::Supported Types Test: 
BMimeType(testAppSignature1).Install() == B_OK
    TestCaller BAppFileInfo::Icon Test: appFileInfo.SetIcon(fIconM1, 
B_MINI_ICON) == B_OK
    TestCaller BAppFileInfo::Icon For Type Test: 
appFileInfo.SetIconForType(testType1, fIconM1, B_MINI_ICON) == B_OK
    TestCaller BAppFileInfo::Info Location Test: type.Install() == B_OK

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