Load official SQLite 3.7.17.0
Merge branch 'master' into sqlite-3.7.17.0

Conflicts:
	backup.c
	btree.c
	btree.h
	build.c
	ctime.c
	expr.c
	fts3.c
	fts3_aux.c
	fts3_expr.c
	fts3int.h
	func.c
	global.c
	legacy.c
	loadext.c
	main.c
	memjournal.c
	mutex.h
	os.c
	os.h
	os_unix.c
	os_win.c
	pager.c
	pager.h
	parse.c
	pcache.h
	pragma.c
	prepare.c
	resolve.c
	select.c
	shell.c
	sqlite3.h
	sqlite3ext.h
	sqliteint.h
	tclsqlite.c
	update.c
	util.c
	vacuum.c
	vdbe.c
	vdbeapi.c
	vdbeblob.c
	vdbeint.h
	vdbetrace.c
	wal.c
	wal.h
	walker.c
	where.c
Add new file fts3_tokenize_vtab.c to build description.