Add Reader Timeout option for data-disruption cases

[rokath]

Change

func NewDecoder(r io.Reader, size int, multi bool) (p *decoder) 

into

func NewDecoder(r io.Reader, size int, multi bool, timeOut time.Duration) (p *decoder) 

The timeOut, if 0, does not influence the current Read behaviour. Otherwise, if a successfully decoded package needed internally more than the timeOut, Read returns together with the data an error containing a data-disruption warning.

[rokath]

Add also tests for this .