Change-Id: I89d9fd64dc22c90680bb05415cc966c255165af9
Change-Id: I1b43414aaec8ea217b39a0d780c80a25409d0991
add a package description, revise class descriptions and edit some method docs Change-Id: Ice969a99c830349674c65d99e4b7a6f1d2f24a7e