Log Message:
Update ruby-ole to 1.2.11.7.

== 1.2.11.7 / 2013-06-24

- Various encoding fixes to make tests pass on current rubies.
- Fix RangesIO#write behaviour when passed an encoded string (github #14,
  romuloceccon).
- Fix Dirent#each_child attempting iteration on file children (github #13).
- Unused variable fixes to avoid warnings (github #12, kachick).