Update INSTALL.md

OSX Instructions added.
Updated nTox.c (added timestamp)

It's very glitchy. But it works.
Merge pull request #74 from mouseym/patch-1

Update INSTALL.md
Merge pull request #76 from notadecent/master

Updated nTox.c (added timestamp)
Merge branch 'master' of https://github.com/irungentoo/ProjectTox-Core
Going with irungentoo's suggestion and using memcpy instead of sectioning with arithmetic