* Use reference instead of pointer for getStream.
* Use reference instead of pointer for getFormatContext.

Necessary if I want to use the InputStream returned by getStream
function.

Use reference instead of pointer in the constructor.

Use reference instead of pointer in the constructors.

SetImageParameters by the ImageDesc instead of the complete Image.

Throw runtime_error in readNextPacket if try to read packet on non-
bufferized input stream.

* InputStream: update comment.
* InputFile: add comment.

Add comments to prepare the field for the template !

…scoder into dev_refactoring

Conflicts:
	src/AvTranscoder/InputFile.hpp
	src/AvTranscoder/Transcoder.tcc