Resolve bug #65. Correctly convert blob values to ruby
Add test for calling function with blob argument (#65).
Also, improve testing of blob storage in general, utilizing Blob type to correct column affinity.
Improve test for #65 to prove that the blob is passed into the function correctly
Merge pull request #97 from jdberry/patch-65-stable

Backport patch for #65 to 1.3 stable branch