Removed 1.8.7 testing.

I did this because 1.8.7 testing was failing because Code Climate code
coverage gem is written to only support 1.9.2 and up. It uses the new hash
syntax. I created a ticket to further investigate if we really need to support
1.8.7 or not. If we find we do then we will have to add 1.8.7 testing back and
identify a different code coverage solution that will work with 1.8.7.