first try at bootstrap-based website

fix link paths, fix some css

add documentation overview page, small fixes
"fix" sidebar stuff - this was not my idea
remove gray boxes around h3 on the two new pages
put banner into header, make it spread over whole page
FIX added some descriptions to each categories in the main webpage
FIX spelling mistake
FIX the css in the API
Fix link to flowchart, add text descriptions.
Minor fixes in front-page text, css
rework front-page box texts
fix typo, missing p
fix and refine some css and html tags
ENH added the fork me ribbon to the website
add example banner image
Mr. Proper, act 1
add section, estimator and model links on the frontpage
fix styling of rst links
Banner improvements
add links for examples
Banner style