* Update build.gradle
remove jwt lib
* Update Picacomic.kt
Remove the effect of jwt library to fix the conflict from GSON
* Update Picacomic.kt
remove redundant code
* Update build.gradle
bump extension version
* Make it more prescriptive
* Improved compatibility with older versions
* 1.switch to android.util.Base64 API to improved compatibility with older versions
2.Convert the literal constant named leeway from a method parameter to a private member constant, this will improve performance a bit...