Enhancement: update to ChefSpec 3.0.0

 * replace my custom rake task with something 'more official'
 * update references to deprecated calls
Update: use new `rake spec`
Update: update spec file (new syntax nitpicks)
Updates: probably for chefspec 3
Update: attempt to stub commands executed
exit level != 0 when rake tests fail
fixing php-apc test
mocking mixlib shellout, this needs more work
Update: disable the test to ensure 'binaries' are linked

 * chefspec cannot evaluate resources in a loop
 * so e.g. chefspec not able to tell a link resource was executed when the "resource.name" is dynamic
 * this sucks
 * the end
Merge pull request #123 from till/topics/chefspec-refactoring

Topics/chefspec refactoring