doc + function stub describing on_or_off

refs #19
added function to make all elements greyed out
fixed typo
Merge branch 'untoggle' into gh-pages

Fixes #19
Merge branch 'gh-pages' of https://github.com/jessicamcinchak/chartercomplex-client into 22_cleanup
more style improvements, remove some unused code
refs #22
Merge branch '22_cleanup' into gh-pages
filter box for testing
filter nodes and links based on year

@todo filter related text objects

refs #17
hide paths by year

refs #17
fix index bug
hide labels of hidden nodes

refs #17
fix doc typo, add doc, remove debug code
Merge pull request #23 from bnchdrff/17_filter-by-year

filter by year