Use exact GHC versions rather than major-version #736 #784
Description from the commit:
* Stack now defaults to matching the minor version specified in the resolver / snapshot, whereas before only the major version was significant. * Adds a 'compiler-check' field which specifies a policy for checking the GHC version. * Changes the format of stack-setup.yaml, and so changes which URL is used to find it (in order to not break old stack versions). * Refactors ensureTool code, as it already had a lot of special cases, which I found confusing. Main cause is that I needed to pass in a 'CompilerVersion' instead of 'Version', but just for installing ghc, not for git. * Introduces a 'CompilerVersion' type, and changes some naming to specify that compiler versions are being passed around rather than ghc versions. The change could be a simpler without this, but this will be helpful for GHCJS support.
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