Add codestyle and minor features

Quick fixes

Refactored version

Lombok is now provided

Update dependencies

Add OSGi bundles

Added default content-type.

OpenFeign#10

- Added javadoc for public and protected methods;

- Refactored pom.xml files for 2 spaces tabs;
- Added gitignore rules for Netbeans IDE and test's output files.

OpenFeign#5