dose_response_grid: rough beta
for #185, remove "None" values from csv downloads
fix html bug
rename sensitivities app

new app name: 10_1038_nchembio_1337__fallahi_sichani_2013
new url: /explore/10.1038-nchembio.1337/fallahi-sichani-2013

the old url (/explore/sensitivities) now resolves to the new url above; also, the url

/explore/10.1038-nchembio.1337/

resolves to

/explore/10.1038-nchembio.1337/fallahi-sichani-2013

(It's a bit more complicated than that; see the regexps in urls.py for
the details.)
dose-response grid in own page
include tools table in landing page
BEZ235 -> Dactolisib
Merge branch 'dose_response_grid' into dev
Updates to the welcome page
add a label to the filter results
merge updates for filter and welcome page
fix bugs in fallahi-sichani 2013 page