Rename writebuffer(wb) to rambuffer(rambuf)

The abbriv wb is conflicted with that of writeboost.
Big change: rename to writeboost

All sources and file names are changes to writeboost
fix MAINTAINERS
fix README
Rename to Writeboost completed

Now all sripts works.
add zip_safe=False to setup.py
Modified dm-writeboost.txt