World War II history buffs should set aside a good part of Monday for some light reading. Maybe some of Tuesday. In fact, don’t make any plans the rest of the month. The “Gray Book,” a collection of communications from Fleet Adm. Chester Nimitz that range from the Pearl Harbor attack to the days before Japan’s surrender, has been digitized and will be unveiled Monday as part of a live web program on the Navy’s official blog. The document — brittle from long-term storage and classified until 1972 — had been scanned previously, but better, searchable scans will offer easier…