update deps
Readme.md: link to JSHint and csslint
binaries-are-signed.rst: use the right class and style for internal link
add a donations page with Flattr and Paypal
donate.rst: clean up flattr code
donate.rst: use the bigger paypal logo
move flattr code in the footer
remove border="0" since we do that in the css
remove text for the time being
add text, dollars/euro