sqwashing some bugs
sqwashing some bugs

- fix marginnote sidenote widths
- changing img width to 100%;

Laidlaw/tufte-css,Zegnat/tufte-css,paperdavid/tufte-css,zakgreant/tufte-css,daveliepmann/tufte-css,crmackay/tufte-css,steven-miller/tufte-css,mgraupner/tufte-css,edwardtufte/tufte-css,jeremykenedy/tufte-css,Arty2/tufte-css,kristofer/tufte-css,d2m/tufte-css,bcmoseley/tufte-css,0atman/caddy-tufte-blog,caraya/tufte-css,Hillea/tufte-css,abremges/tufte-css,anfedorov/tufte-css,altaf-ali/tufte-css