Collect metrics into a file for comparison during CI to prevent entropy

[petemounce]

Collect metrics (coverage, fxcop w/e, ndepend CQLs, etc) into a file during a build.

Create a comparator so that we can grab this file from the previous successful build and compare this build to that, and fail the build if entropy is encroaching.

This forces people to not commit code that makes the codebase worse...