README.md: more tweaks
README.md: more tweaks

- make some of the "quick examples" more explicit (for someone who's
  just taking a look)
- fix "create a byte array" example

sebgod/node-java,sebgod/node-java,joeferner/node-java,joeferner/node-java,sebgod/node-java,sebgod/node-java,sebgod/node-java,joeferner/node-java,joeferner/node-java,joeferner/node-java,joeferner/node-java,sebgod/node-java