Fixed Issues Unique to Ubuntu

Syntax usage in bridge.c was fixed such that make and make test could run w/o giving errors from type mismatches when run in Ubuntu.
Merge branch 'master' of https://github.com/tassiahmed/Sia
Wrote In-Place MergeSort Algorithm into erasure.c

- commented out (for now) the old sort algorithm
- wrote and implemented an in-place mergesort algorithm to take its place.
- currently experiencing same error as when trying to implement mergesort
- not complete until error is fixed