Fix for issue 4 (https://github.com/irobertson/pojomatic/issues/4) - 
  Under Java8 ASM classreader fails

The cause is that asm4 cannot read java8 class files. Since our test
classes were generated using java 7, this was never discovered in unit
tests. We now have a profile which also compiles and runs test classes
under java 8 when available.