examples: add benchmarks/run.sh

sample ../bench.sh script:
make clean archclean
perl Configure.pl --optimize=-O3
make -j4 -s
make -j4 test_prep
time examples/benchmarks/run.sh

=>
master        	f8510c7: 0m44.284s
rurban/6model 	9055a9e: 0m43.407s
rurban/pmc2c_orig 	6cbf270: 0m43.767s
examples: more benchmarks

add and verify http://whiteknight.github.io/2011/05/10/timings_vtable_overrides.html
as winxed files
examples: prepare winxed pirs

 document internal src/pmc/resizablepmcarray.pmc functions
examples: add cleanup

use only parrot without -O2 in examples for better comparison with older versions