Updates kgio to v2.9.3
Updates kgio to v2.9.3

This adds compatibility for ruby 2.2.0 while retaining compatibility
with 2.0.x and 2.1.x.

adscott/stringer,Koronen/stringer,Koronen/stringer,milligramme/stringer,swanson/stringer,run-project/stringer,lodestone/stringer,jeroenj/stringer,mpraglowski/stringer,nobuti/stringer,nibble/stringer,dperson/stringer,dandorman/stringer,jqr/stringer,jqr/stringer,adscott/stringer,Koronen/stringer,swanson/stringer,run-project/stringer,nibble/stringer,InPermutation/stringer,lodestone/stringer,jeroenj/stringer,swanson/stringer,Koronen/stringer,geemus/stringer,thiagosil/stringer,lodestone/stringer,milligramme/stringer,swanson/stringer,mpraglowski/stringer,jeroenj/stringer,thiagosil/stringer,jqr/stringer,milligramme/stringer,InPermutation/stringer,dperson/stringer,InPermutation/stringer,nibble/stringer,nobuti/stringer,run-project/stringer,geemus/stringer,jeroenj/stringer,dperson/stringer,dandorman/stringer,dandorman/stringer,geemus/stringer,dperson/stringer,nobuti/stringer,jqr/stringer,mpraglowski/stringer,geemus/stringer,adscott/stringer,nibble/stringer,thiagosil/stringer,adscott/stringer