Messing with data layout for viewing

Improving SQL query to get token data and ordering data by TokenLink
index then the distance.  Hopefully placing the searched token between
the two will obviously indicate relations.
Changing format of token page layout prior to d3

Changed Token formating to a 4 column setup where the token is centered
between the prior and following tokens.  Changed query slightly to
include more prior tokens.
Using Flex boxes in CSS layout for header info

Added a new flex box to the body header mainly to learn the flex box,
but also might be a good avenue to display the data.
Untested luigi tasks for transforming token data

Created two luigi tasks for creating Token frequency distribution and
and the TokenLinks which get serialized and will be inserted to database
in following tasks.
Untested prototyping of the Token[Link} inserts

InsertTokens and InsertTokenLinks tasks defined for loading each table.