[JAVA okhttp-gson; target=Android] Remove joda-time dependency for Android

[sytolk]

Android usage for generated client is completely wrong. It`s have Java libraries like joda-time included for Android its have completely different version of libraries like:
https://github.com/dlew/joda-time-android

This is the dependency library generated in client:

dependencies {
    compile 'io.swagger:swagger-annotations:1.5.8'
    compile 'com.squareup.okhttp:okhttp:2.7.5'
    compile 'com.squareup.okhttp:logging-interceptor:2.7.5'
    compile 'com.google.code.gson:gson:2.6.2'
    compile 'joda-time:joda-time:2.9.3'
    testCompile 'junit:junit:4.12'
}

Warning: org.joda.time.DateMidnight: can't find referenced class org.joda.convert.FromString
Warning: org.joda.time.DateTime: can't find referenced class org.joda.convert.FromString
Warning: org.joda.time.DateTimeZone: can't find referenced class org.joda.convert.FromString
Warning: org.joda.time.DateTimeZone: can't find referenced class org.joda.convert.ToString
....
FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
  Job failed, see logs for details

If I set 'dateLibrary' : 'java8' joda time is replaced with Java8 time package. But my android project is java 1.7.
What about to separate Android templates from Java (like Volley)?

[wing328]

@sytolk looks like there's no decent single datetime package that works with both Android and Java

What about adding another dateLibrary option joda-time-android?

cc @cbornet

[cbornet]

Last time I checked, joda was working fine on Android...
Of course we could use the optimized lib for android but that's a different subject. Actually we could have a flag that would configure everything for Android (gradle, jdk6, joda-time, etc...).