Fixes a bunch of segfaults when you crash and burn!

Double free on thrown exception... FIXED!
Unclean exit on sigint... FIXED!
Functions that sc and lb shouldn't have had... REMOVED!
Scope in Posixmain... MORE SENSIBLE.
Merge pull request #172 from scj7t4/ExceptionCrash

Fixes a bunch of segfaults when you crash and burn!