Organized methods in GlowServer.
Tidied and implemented parts of GlowWorld, minor GlowServer implementation fixes.
Tidied GlowBlock and GlowEntity and implemented metadata methods.
Minor cleanup in GlowChunk, GlowBlockState, and GlowLivingEntity.
Update build.gradle

- Add 'mavenLocal' to repository list.
- Specify to not include '-shadow' in the JAR name in
  /build/distributions/.
- Specify default tasks to perform, now you can just run 'gradle' (or
  'gradlew'/'gradlew.bat')

Signed-off-by: Steven Downer <grinch@outlook.com>
Update README.md

Signed-off-by: Steven Downer <grinch@outlook.com>