New class DirtBaseGenerationLayer + tests

Added a dirt base generation layer that spawns a square of dirt tiles
and tested it on the main.
Bug fixing

Uncommented line of main.
Removed return on Gallimimus.as
Layer param adjusting

Changed res
Merge pull request #5 from mentatzoe/master

New class DirtBaseGenerationLayer + tests
Modified beach generation

Modified kind of tiles taken into consideration to just take into
account dirt.
Merge pull request #6 from mentatzoe/master

Modified beach generation
Merge https://github.com/Amarcolina/DinoSwarms