Refactoring of the authorization headers.

Will no longer require to username/project-id, instead it will simply
send request without authorization header.
Refined project build.

Added developers clause.
Bumped sbt version, bumped library dependencies version.

Removed commons-io and commons-codec.

Core and http are now considered modules and are not individualy
published, but are added to sources of project http-android and apache.
Names under wriche they are published are changed to dsl-client-http
and dsl-client-http-android.