Change all require RMagick to rmagick
Merge pull request #157 from gemhome/dogfood_our_requires

Change all require RMagick to rmagick
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