Merge pull request #22 from maning/master

Add overview
Merge pull request #1 from essc/master

Changes to the overview section
Merge pull request #23 from maning/master

Inital materials dump
Merge pull request #24 from maning/master

References and funders, use a text file for contributors
Merge pull request #2 from essc/master

Recent changes
Merge pull request #1 from csupsup/master

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