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.
Merge branch 'master' into platform-version-overrides
Parse platform support as a dependency.

Platform strings used in override tables or the supported_platform list
is a dependency string. The deps.match_platform function will compare
this string to the detected platform and system name. The old
cfg.is_platform function matches only plain strings against built-in
platform names (like it always has).