EventPress v1.0.0 with test cases

First release of EventPress for Android/Kotlin.
v1.0.0 includes:

• simple APIs (see details on EventPress.kt and MainActivity test cases). Just observe()/publish() call is enough.
• easy to manage event stream using topic hierarchy, class type or
• managing various streams with topic which is very similar with MQTT protocol.
• publish or subscribe event to multiple topic using topic hierarchy.
• supports receiver on UI thread, backpressure strategy, stream control valve.
• supports reactive style usage and simple usage.
• Kotlin and Android compatible.