`bin.size` parameter in `LoadTrackFile` has no effect when normalization is "none"

[m-jahn]

• when trying to look into the issue #9 it became clear that LoadTrackFile is not very flexible
• many defaults are explicit for examples or human chromosomes in general (like "region = chr4" etc)
• the bin size parameter does not work without normalization but it could be implemented easily
• I try to do this

[m-jahn]

• can also add feature to take strand information from bam files into account

[m-jahn]

gets fixed with 8c537bbc13c6a95ebfa3f6d6c44c495e0a21af2f