updated android project and doc

v1.4 (Picovoice#52)

v.14 comes with improved accuracy (especially tiny variant) and runtime optimizations.

v1.3 (Picovoice#37)

* updated resources and linux binaries

* updated android binaries

* updated windows binaries

* updated embedded arm binaries

* updated mac binaries

* updated ios and watchos binaries

* updated doc

V1.2 (Picovoice#11)

* updated resources and Linux binaries

* updated android files

* Added mac and ios libs

* added RPI arm11 binaries and fixes to python interface

* RPI 2/3

Ver inc (Picovoice#8)

* updated resources and linux binaries

* updated android binaries

* updated mac binaries

* updated ios binary

* updated raspberrypi binaries

* added releases to main readme

updated main readme.md