adding ietf to examples urls by default
fix in processing to check for Message-ID; new matricize function; iPython notebook does a simple Levenshtein example

Conflicts:
	bigbang/process.py
	examples/Plot Activity.ipynb
library functions for handling Levenshtein matrix, and a second, more focused visualization

Conflicts:
	bigbang/process.py
basic consolidate columns function, and a notebook which creates the tuples and tests it

Conflicts:
	bigbang/process.py
	examples/Plot Activity.ipynb
more nuanced edit distance algorithm; cleaner example for consolidating columns; before/after graphs

Conflicts:
	examples/Plot Activity.ipynb
clean up process.py after merging back in @npdoty #52 commits
rerun Plot Activity to get this to work with the Archive object