1.7.10 update

- Updated README.md to be a bit more pretty
- Converted all indentation in build.gradle to 4 spaces, instead of it
  being mixed
- Added 1.7.10 version in build.gradle (forge 1206)
- Updated to ForgeGradle 1.2
- Set the run directory to 'runtime'
- Updated a few sources for 1.7.10 changes
- Included dutch translations
- Updated mapwriter version number to 2.2.0