Minor changes to make sure there is a standard time unit(seconds) used across all tools

 Changes to be committed:
	modified:   CHANGELOG.md
	modified:   README
	modified:   README.md
	modified:   conda.recipe/meta.yaml
	modified:   docs/conf.py
	modified:   docs/index.rst
	modified:   docs/notebooks/cohort_data.ipynb.rst
	modified:   docs/notebooks/filters.ipynb.rst
	modified:   py_notebooks/cohort_data.ipynb
	modified:   py_notebooks/filters.ipynb
	modified:   resonate/__init__.py
	modified:   resonate/cohorts.py
	modified:   setup.py
	modified:   tests/cohort_test.py