improve bench scripts and new 20140530.data

try to run older releases with --m=32 and
patch NUM_REGISTERS 40 <= 1.7.0

added all-bench.sh
1st try in gnuplot with parrot-bench-20140321.plot

even with filledcurve. but we need to keep the 3 line labels.
Merge branch 'master' of github.com:parrot/parrot-bench

Fixed Conflicts:
	README.md
new scripts, with proper post-processing now
Merge branch 'gnuplot'
ran -m32 benchmark parrot-bench-m32-20140631.data and parrot-bench-20140701.data

updated scripts, better log.bench-$date format, automatically create .data, .plot and .png