Implement configurable metric namespace.

This is an implementation of pull request etsy/statsd/#137.
add wrapper to start bucky from source tree
set nice levels, drop priviledges and add supervisord example config
add requirements
use requirements in setup
fix multiple parameters in the same line, microoptimize line handling code for speed
optimalisation; if not "|" in sample seems to be about 16% faster then len(fields) < 2
simplify guage delta code
rename bucky to bucky2
fix missing self reference for metrics
fix all style problems indicated by flake8 bucky2 --ignore=W391,E501
fix style problems for non package files
add .travis.yml
add note about origin project in README
use open not file
ignore bucky2.egg-file and build/ directory
fix travis issue with multiprocessing and shared memory on build vm
install collectd in travis needed to run tests
install both collectd and collectd-core
remove useless print statement