Fixing #323

Rendering should now continue, however, any errors will be rendered in
the file, similar to what sinatra, rails, Play and others do.
Fixing the Travis build
Better test
Logging conditionally
rescue Tilt load error and provide sensible message

- also prevent the AsciidoctorTiltMatcher from loading other Tilt templates
Merge pull request #1 from mojavelinux/rescue-tilt-load-error

Rescue tilt load error
Merge pull request #325 from LightGuard/issue_323

Fixing #323