v2.1.4 released

updated gradle

Merge remote-tracking branch 'origin/master'

fixed incorrect call type recognition on old firmwares

v2.1 released. resolve #4.

v2.0 released

v2.0-beta1 released

v2.0-alpha2 released

put recording params to custom params to prevent be GCed/killed

change app icon

add zh_CN translation
fix bug that use previous info while caller is unknown