updated patches for current 2.1 head
Merge pull request #2991 from skaes/ruby-2-1-head-patch-update

updated patches for current 2.1 head
Add "float_warnings" patchsets for 1.9.3-p547, 2.0.0-p481 and 2.1.2
Merge pull request #3004 from knugie/master

Add "float_warnings" patchsets for 1.9.3-p547, 2.0.0-p481 and 2.1.2