Merge pull request #203 from alisoncallahan/master

Updates to statistics script and nscounter.php
Merge pull request #205 from alisoncallahan/master

HTML summary script
added logo, links and descriptions to summary pages
added logo, links and descriptions to summary pages
minor mods to css
Merge pull request #206 from jctoledo/master

updated endpoint summary page
Merge pull request #207 from alisoncallahan/master

Adding sorting to HTML summary table
minor edit of table heading
Merge pull request #208 from jctoledo/master

minor edit to table heading
added two tables made other minor updates
Merge pull request #209 from jctoledo/master

added two additional tables to dataset descriptions
Updated bio2rdf-html-summary.php: changed links at top of page, and updated code to ensure that incorrect links for individual datasets are not added