rem instances and mod cn_17 as well as GoldenReader
mod test
add writerTests
does not allow VrpReader to set null coord
Merge branch 'master' into routes-with-specified-start-and-end
does not allow reader to set null coord
Merge branch 'master' into routes-with-specified-start-and-end
add test
bugfix issue #77
Merge branch 'master' into routes-with-specified-start-and-end
bugfix issue #78
bugfix issue #79
Merge branch 'master' into routes-with-specified-start-and-end

Conflicts:
	jsprit-core/src/main/resources/vrp_xml_schema.xsd
	jsprit-core/src/test/java/jsprit/core/problem/io/VrpReaderV2Test.java
add tests