(Gazette Photo by John Ruch) The “JP Free Tiny Library,” a house-shaped wooden box set atop a City street light control box at South and Bardwell streets, invites passers-by to “take a book, leave a book” earlier this week. It is unclear who placed the “library” there or when. Books on math, Tibet and the history of punk rock were among the offerings. The site is across South Street from the Jamaica Plain Branch Library, which had been closed for repairs.