Update README.md
added model.matrix method for extracting designs
Delete BayesFactor_0.9.9.tar.gz
Update NEWS
added fixedMargin argument for conting. tables

fixedMargin determines which margin is fixed for the independent
multinomial sampling plan.
add fixedMargin to post. samp. of cont. tables
started null gibbs sampler for pois cont. tab.
Added sampling for cont. tab. except hypergeom
recompiled documentation
fixed noSample argument for cont. tab.
sampling for hypergeom null cont. tab. added
Added skel. of hypergeom alt. sampler (no guts)
fixed recompute() with cont. tables
Rebuild documentation