Missing format() function.
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Merge pull request #369 from Geod24/fix-readme

[Trivial] Update link to Build Status
Merge pull request #368 from p0nce/master

Missing format() function.
Don't try to reinstall (remove) unmanaged branch based dependencies.
Don't print possible upgrades of the root package.
Fix lookup of sub packages from within sub packages of the same package. Fixes #357.

When the root package was a sub package, any reference to another sub package was looked up relative to the root (sub) package instead of its base package.
Add .def files to the list of source file types to pass to the linker.