`ner build` doesn't pass return code via bash

[Cynosure-null]

Observed Behavior

After compiling code, the ner build tool doesn't pass the compiler's return code through to the shell. The expected behaviour would be if ner build were to fail with code 2, that return code would be returned.

Steps to Reproduce

1. Ensure code won't compile
2. $ ner build (should fail)
3. $ echo $? (expected value: 2, actual value: 0)