Build subsections.
fixed a few grammar issues
Merge pull request #37 from yaph/gh-pages

fixed a few grammar issues
Rebuild
Remove datum
Move datum into extra
ebook
Title and description for ebook
Add GPS illustration
Add GPS image
add cname
Improve contributing, add contributors
Fill out more introduction sections.
Use default base font.
Improve style, remove base. Fixes #38
Fix likely typo around topology
added info on heatmaps and contours
added explanation of TIN, and broke out TIN methodologies into a list
Merge pull request #41 from morganherlocker/gh-pages

Interpolation methods
Grammar regularity tweaks