Remove unnecessary call to partial in second koan

juxt returns a function that takes a variable number of arguments, so a
partial taking one argument does not need to be created.
fix spacing issue in 05_maps.clj
Merge pull request #76 from mjansen401/master

fix spacing issue in 05_maps.clj
Merge pull request #74 from ajmccluskey/21-remove-partial

Remove unnecessary call to partial in second koan
merge upstream