Change "My Account" link

Closes #80
Add favicon to Smarty templates

Fixes #77
Link repayment rate on "Lend" page to definition

Closes #76
Add RANDOM_NUMBER to main.css and styles.css
Center page content

Closes #79
Minor edits to Lend page filters/sorting

Closes #92
Add Google Analytics tracing code to Smart templates
Add Sift Science tracking code to Smart templates
Merge branch 'design/centered'