Add local aar and jar generation support

[Guardiola31337]

• Added local aar and jar generation support
  In order to build locally (same procedure to both Android and Java libraries):

1. Set IS_LOCAL_DEVELOPMENT gradle property to true (is false by default)
2. $> gradlew uploadArchives
3. aar or jar will be automatically installed in your Maven local repo folder (.m2/M2_HOME)
4. Remember to add mavenLocal() in repositories{} (build.gradle) in the project in which you'd like to use Maven local repository

• Fixed javadoc issue

👀 @zugaldia

[zugaldia]

Bravo. This is a great solution.

Set IS_LOCAL_DEVELOPMENT gradle property to true (is false by default)

Per chat, let's explore how to set IS_LOCAL_DEVELOPMENT as an environment variable, with the plugin defaulting to true to make public releases more explicit. That way, we'd need to update our Bitrise rules to be like IS_LOCAL_DEVELOPMENT=false ./gradlew uploadArchives before uploading the artifacts.

[Guardiola31337]

@zugaldia done 😉
Now if you want to install aars or jars in your Maven local repository you should define IS_LOCAL_DEVELOPMENT environment variable like this:

$> export IS_LOCAL_DEVELOPMENT=true

And $> export IS_LOCAL_DEVELOPMENT=false if you want same behavior as before. If IS_LOCAL_DEVELOPMENT is not exported also works as before.

[zugaldia]

Next, I want isLocalBuild to return true by default to make releases more explicit. Let's ticket that separately.