Previously `titleize` used `capitalize!` which has the side effect of
returning `nil` for anything already starting with a capital letter. This
commit changes it to just `capitalize`.
Example, before:
A file "2016-01-01-This-is-a-title-with-Capitals.markdown" would return "Is A
Title With" for `post.title`
Example, after:
A file "2016-01-01-This-is-a-title-with-Capitals.markdown" will return "This Is A
Title With Capitals" for `post.title`
Tests added for `titleize_slug` in test_utils.rb
Fix problem introduced in
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| jekyll.rb | ||