Update README.md
Rename Map to Field. Close #7
Refactor code a little.
Add a Travis setting file.
Add setting files for travis-CI and coverall.
Merge pull request #8 from AI-comp/refactoring

Refactor code a little
Remove 2 byte characters
Update .travis.yml

Add various Scala versions and JDK versions as target platforms.
Add build command.
Merge branch 'buildcommand' of github.com:AI-comp/Terraforming into buildcommand