REVIEW: [NX-420] File Blob Store builder

JIRA: https://issues.sonatype.org/browse/NX-420

Feature Build:
http://bamboo.s/browse/NX-OSSF59-3 :thumbsup: 
That flushed out several errors, so it was helpful, but ultimately it wasn't compatible with a few areas of Nexus that are relying on implicit bindings.  With the injector wrapped this way, it's totally fine for kazuki to have .requireExplicitBindings() on, since it won't bleed out to Nexus' injectors.