Fixes bug 869033 - Made build_id a more picky field. r=peterbe
Merge pull request #352 from AdrianGaudebert/869033-build-id-field

Fixes bug 869033 - Made build_id a more picky field.
Fixes Bug 838251 - Adds distinct install per signature to signature summary.
Merge pull request #353 from brandonsavage/bug838251

Fixes Bug 838251 - Adds distinct install per signature to signature summary