Fix #100: Segmentation fault if rows_per_wal = 1
Make gh-100 test case build directory independent.
Merge branch 'stable' into gh-100-rows-per-val

Conflicts:
	test/box/configuration.result
	test/box/configuration.test
Merge remote-tracking branch 'origin/stable'

Conflicts:
	src/box/box.cc
	test/box/configuration.test