Issue #2127: Most-retweeted post; End of Year

Initial work done

New tpl for EOY top 3 posts w/counts

Adding insight-eoy and insight-wide CSS class to insights w/slugs that
match "eoy"

Added test and logic for share and retweet counts text

Code fixes and style updates

[x] Copyright years should be 2014, not 2013
[x] Code style: a few lines exceed max line length
[x] Code style: place else on same line as closing }
[x] Code style: delete consecutive blank lines, at most 1 in any given place
[x] topThreeThisYear and daysSinceJanFirst are missing their docblocks
[x] daysSinceJanFirst might be useful in Utils or another UtilsForEOY class, we'll probably reuse that elsewhere.
[x] Insight frontmatter: Add When line to insight front-matter, make description a sentence with a period, spell out EOY for readability.

Cleaned cruft from tpl

Rendering test output for testFacebookNormalCase

New shouldGenerateEndOfYearAnnualInsight method; cleaned up; ready to go