System.OverflowException in IFDReader.CreateIDFEntry

[codingdave]

For a range of pictures taken with the same camera taglib-sharp was failing with an OverflowException.
This is one example image:
This is the exception I get when using f-spot to import that image:

[codingdave]

I have created a pull request that fixes this issue. #37

[codingdave]

Im not sure what the intention of the code is due to the lack of comments. I feel like there is a better way to fix this, e.g. checking if the size of the ByteVector is larger than the types maximal value and depending on that changing the type... or calling a new function ByteVector.ToSShort() or something else... The code at least fixes importing 82 images on my side into f-spot.