[Fix #363] Load find-func at runtime

We need find-func at runtime for find-function-regexp-alist.  I
overlooked this when refactoring the dependencies, because the f******
stupid byte compiler didn't warn about the add-to-list call.

This partially reverts commit c8babdbb536852ac49978935d9585e7e18a77980.
Add comment to clarify the rist  apt::update dep cycle
Fix the location and release of the CFEngine repo
[Fix #353] Support Rust 0.10 and drop Rust 0.9
Fix test cases for Rubocop 0.19