Added Statistics page for elliptic curves over Q
Merge pull request #16 from JohnCremona/master

Add Statistics page for elliptic curves
EC: url_for link for statistics
Merge pull request #15 from pdehaye/master

optional threading for authentication; fixes threading issue like a miracle, too.
Fixing magma commands for number fields.
Fix wording and knowl reference (suggested by J. Voight)
Updated acknowledgement page and footer
acknowledgment: contributors.yaml file parsed and displayed, easier to maintain
acknowledgement page shows more information and is a table now
Added more contributors' details
acknowledgments: affiliation and websites for many of them; layout is floating divs with fixed size
merged John's and Harald's contributors lists
Minor fixes to affiliations