Merge pull request #154 from newville/master

use versioneer for version info, remove  numpy imports from setup.py
use py3.4 in upload script
add emcee example

remove uncessery pass

whitespace
clean up examples
Merge pull request #156 from Tillsten/emcee_example

add emcee example
Merge pull request #159 from Tillsten/clean_up_examples

Clean up examples