Various renamings
Add Hadoop mode.  Not yet tested.
Fix project name in README.
Various renamings
Add Hadoop mode.  Not yet tested.
Make flows inner classes.
Verify assertion after exit.
Merge branch 'hadoop' of github.com:matt-thomson/de-pijp into hadoop

Conflicts:
	src/test/java/io/github/mattthomson/depijp/InvalidFlow.java
	src/test/java/io/github/mattthomson/depijp/SimpleFlow.java
Allow choice of local/hadoop mode.
Make taps serializable.