Add travis yml.
Add binary upload to github download section.
Merge branch 'master' of https://github.com/kovmarci86/android-secure-preferences
Refactor.
Move Encryption class behind an interface to be easily replaceable.
Move EncryptionHelper to pakcage.
Create EncryptionAlgorithm interface.
Update references, update test.
Update pom.
Add checkstyle configuration, android suppressions.