Testing with docker images available

[Han-Wen Nienhuys]

See https://github.com/hanwen/lilypond-ci.

Example:

$ sh test-git.sh rietveld 557410043
..

(5 minutes later)

$ tail test-results/rietveld/557410043/90a4346b/index.txt
100.000000                     input/regression/accidental-cautionary.log
100.000000
input/regression/accidental-broken-tie-spacing.log
100.000000                     input/regression/accidental-ancient.log
14.198636                      input/regression/test-output-distance.ly
0.300030                       input/regression/tree.gittxt


     0 in baseline only
    57 below threshold
  2606 unchanged

-- 
Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen