Fix #707
Fix #707

mkdir_p is called from in a subdir of build so needs an extra `../` and there is no rule to create the `$(classes)` and everything builds without specifying them as dependencies of the jar.

I've only tested these changes on the Makefile.in
Conflicts:
	Makefile.am

OpenTSDB/opentsdb,alienth/opentsdb,alienth/opentsdb,OpenTSDB/opentsdb,OpenTSDB/opentsdb,MadDogTechnology/opentsdb,MadDogTechnology/opentsdb,MadDogTechnology/opentsdb