Remove box infrastructure and global containers out of project.json [0.17.2]

[mikeschinkel]

The infrastructure containers are the ones the box cannot run without. Currently that is only box/webproxy (should we have named it box/proxyserver?)

The global containers are box/mailsender and box/sqladmin.

None of those need to be referenced in the project.json. I can envision a box.json with a "services" property that lists box/mailsender and box/sqladmin, and box/webproxy/box/proxyserver should be hardcoded as a requirement (although its possible we'd want to allow it to be swappable? But still, we have to have it but I user may choose not to run box/mailsender and box/sqladmin for memory or performance reasons.