f2prateek Fix usage of String.split
The build currently fails with this error:

```
/Users/prateek/dev/src/github.com/f2prateek/rx-preferences/rx-preferences/src/test/java/com/f2prateek/rx/preferences2/PointPreferenceConverter.java:7: warning: [StringSplitter] String.split(String) has surprising behavior
    String[] parts = serialized.split(",");
                                     ^
    (see http://errorprone.info/bugpattern/StringSplitter)
  Did you mean 'String[] parts = serialized.split(",", -1);'?
error: warnings found and -Werror specified
1 error
```

This fixes the usage of String.split as recommended by http://errorprone.info/bugpattern/StringSplitter.
Latest commit 4add60b Apr 22, 2018
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src Fix usage of String.split Apr 22, 2018
build.gradle Use gradle-mvn-push script Aug 23, 2015
gradle.properties Convert to Gradle. Aug 23, 2015