Project is converted to maven project
Add `target` directory to .gitignore
Change code style (e.g. indent with 4 space characters)
Add README
Add tests for `Base64Encoder` class
Change project management tool from Maven to Gradle
Add Gradle Wrapper
Add tests of `OAuthRequestHelper` class
Update Gradle wrapper (version 2.1)
Update README
maven plugin is not needed
Merge: change build system from Maven to Gradle
Fix Javadoc
Change version to represent SNAPSHOT
Maven publishing
`bintrayUpload` task
Merge: change build script to publish artifact to repository on Bintray
Bump version to 0.1.1
Release version 0.1.1