Implement initgroups
version 1.0.2

New call: posix.initgroups()
syslog: fix 'emerg' priority level

Fixes https://github.com/melor/node-posix/issues/20
version: 1.0.3
Add "nproc" support to getrlimit/setrlimit (for supported OSes).
Merge https://github.com/melor/node-posix/pull/26
README credits update
travis: disable node v0.11 testing for now

Disabled until support for v0.11 is added.
version 1.0.4
README: node-posix is battle-hardened by now

Plus a trivial typo-fix.