clear cache correctly for tests
minor
minor
update gradle

Note: gradle seems to create dirty ./build directories occassionally
release version
Merge branch 'styleHacking' of github.com:snodnipper/terrain50-java into styleHacking

Conflicts:
	terrain-50-java/src/test/java/uk/co/ordnancesurvey/elevation/impl/ElevationServiceImplTest.java
add data rename script

trivial script to rename data to something that can be easily calculated.