Use the_author_posts_link() rather than custom lookups

This retains default functionality provided by WordPress core,
including the matching filter.
Remove commented code from post template
get_the_date() is more predictable on archive pages than the_date()
Adjust spacing for readability
Additional space adjustments, commenting
Merge pull request #79 from washingtonstateuniversity/update/template

[PR] Adjust portions of articles/post template