move first test to gradle

build.gradle

src/main/resources/log4j2.xml

src/test/jastadd/errors/.gitignore

src/test/jastadd/errors/Errors.expected

src/test/jastadd/errors/Errors.relast

src/test/jastadd/errors/Inheritance.expected

src/test/jastadd/errors/Inheritance.relast

src/test/java/org/jastadd/relast/tests/errors/Errors.java

tests/errors/.gitignore

tests/errors/Makefile