Add script to build image

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Generate readable error if assembler is not available

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Generate benchmarks data

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>
Move benchmarks file to nginx directory

Signed-off-by: Michael Barton <mail@michaelbarton.me.uk>