Break extconf.rb into an object with methods
Make extconf.rb 1.8 compatible
Remove redundant 1.8 test from CI
Merge pull request #154 from gemhome/cleanup_extconf

Make extconf.rb (a little) easier to understand
Revert "Merge pull request #147 from mockdeep/simplecov"

This reverts commit 2b91e03fdf382a61cfac3c59d4c57f5dc41de836, reversing
changes made to e587bdc6710dfcd457ea439ef14bdf22a93ba8b6.
Remove all require_relatives
Add SimpleCov
Fix hard-coded ruby path
Simplify minimum required ImageMagick version checking
Fix test load paths for 1.8 vs. >= 1.9