Add UTF encoding header to HookRunner
Add UTF encoding header to HookRunner

We're only adding this to this file since it is the only file that
attempts to use UTF-8 characters in its code. We may at some point add
this to all other files, but for now this allows the build to pass on
Ruby 1.9.3.

Change-Id: I4bf3694d85885c9df07a31d9c33c3ad37ee84aaa
Reviewed-on: http://gerrit.causes.com/35644
Tested-by: jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@causes.com>
Reviewed-by: Shane da Silva <6f6e68d1df92f30cb4b3ce35260ddf94a402f33d@causes.com>

gnagel/overcommit,oxocode/overcommit,oxocode/overcommit,TheSooth/overcommit,blech75/overcommit,TheSooth/overcommit,gnagel/overcommit,blech75/overcommit