Add context variant of getFromNativeConverter and getToNativeConverter
Re-arrange posix_spawn and related classes to not be in main LibC definition, since it is pretty unix specific
Add some posix_spawn tests
Clean up after each posix_spawn() test
Make Windows native rmdir 1) return proper errno 2) untoggle read-only to make it remove in that case 3) new convenience method wlibc() to remove all that ugly casting
handle type for std value can vary depending on how a process is supplied them.  Make test a little more general
skip test which cannot run properly on windows
Windows has no getgrnam/getgrent impl
Make getgid return 0 like getuid (matches MRI and is fairly useless on windows)
Skip passwd tests for windows
Use useful isUnix() instead of windows checks to better signify intent of what is being tested (e.g. unit features)
Bump version to 2.4.0-SNAPSHOT
[maven-release-plugin] prepare release 2.4.0
[maven-release-plugin] prepare for next development iteration
Add signal-handling support to POSIX.
remove leftovers
add jackrabbit for webdav deployments
Make tweaks suggested by @wmeissner.

* Use HashMap + synchronized block for signal handlers.
* Bind native signal function with intptr_t return type.
Possible fix for JRUBY-7038 - compare times(3) return to -1, not < 0 for error.
Use AtomicBoolean in signal handler tests.