Fix problem to catch NoMethodError

from non receiver object
fix dependency
specs
Merge branch 'master' into patch-1
fix for 1.8.7
fix bundler for travis
fix bundler for travis
1.8 redcarpet
respond_to
test case
rbx
rbx error msg
Merge pull request #12 from le0pard/patch-1

Fix problem to catch NoMethodError from non receiver object