app store and build fixes

[nick1udwig]

Problem

1. Core packages are not rebuilt properly when they are changed,
2. app_store does not properly return a failure for certain obvious fail cases.

Solution

1. Output the required rerun-if-changed in build.rs,
2. Handle the Responses.

Docs Update

N/A

Notes

Looking at the develop branch, I think #283 did not make it into the previous release.