minor updates to the testing.sh script
Should fix installation of parallel LuaRocks versions when using 'make bootstrap' on both.
Thanks to Philipp Janda for the test case!
accept numbers as first character of a rock name in a dependency
Make LR stop complaining when the 'doc' directory is missing.
Also, handle missing directories explicitly specified in copy_directories as errors.
Closes #142.
Fix regression when installing modules in subdirectories. Closes #143.