modified:   .travis.yml
- calls silent nosetests (no capture plugin which is on by default).

new file:   Makefile
- Added a better `make clean`

new file:   jterator/tree_output.py
- Adding new module to help visualize progress of JteratorRunner. Supports
  JSON, ASCII, ANSI and NULL outputs.

modified:   setup.py
- Modified and fixed wrong arguments in setup().

new file:   tests/mock/expected_ansi
new file:   tests/test_tree_output.py
- Tests for HierarchicalOutput() instances.