Error-checking, Dependency, and Sanity Check Cleanup

[valarnin]

Some cleanup that should be done.

The following should be moved to the beginning of their setup-stage#.sh scripts:

• [x] stage1: Check for $HOME/bin and permission to create
• [x] stage2: Check for patchelf binary
• [x] stage2: Check for unzip binary

stage1 and stage2 should have error checking added for any fs/proc read/write calls

[valarnin]

No longer relevant