remove hide0 functionality (please use details/summary tags and set/c…

…lear open attribute)

remove class=collapse and deprecate hide0: should move to details/sum…

…mary tags

fix some spacing interactions with markup around sentence boundaries

fix a couple of edge cases

sentence spaces when quotes are before punctuation

cleanup regex

support sentences ending with year etc

detect sentence boundary when close-paren is after stop

em-space before span

readme, OIH inclusion, comment trim, Apache2 license