Prepare 1.2.0 release (#109)

- Bump Bintray plugin version to latest releaes.

Fixes maven artefact generation

* 'com.noisepages.nettoyeur:midi:1.0.0-rc1' dependency annotated with 'api' to be correctly included in .pom file
* upgrade android-maven-gradle-plugin to a version that is compatible with gradle version 3+

Updated documentation to show latest version

Bumped PdCore version to 1.0.3-SNAPSHOT

Release version 1.0.1

release v1.0.0 (removed rc from version name)

release 1.0.0-rc4

Merge pull request #23 from tkirshboim/master

Updated tools, replaced maven central with jcenter