Bump version to 5.1.0

REL: ver bump v4.8.2

Update android build

REL v4.8.0: 76ed479

REL v4.7.1a: 283c32a

REL v4.7.1: 6bb1907

REL v4.7.0: 1aac90b

REL v4.6.0: 761dcf4

REL v4.5.2: bc8f438

REL v4.5.0: 461a8e2