adding all chapter view for print, needs a second look (image not showing)
Merge branch 'gh-pages' of github.com:hotosm/learnosm into gh-pages
Add license.
Merge branch 'gh-pages' of github.com:hotosm/learnosm into gh-pages
adding global background color, fixing #65
Typo in English version of "Using Aerial Imagery"
Update 0200-12-22-arerial-imagery-considerations.md

Clarified a few points and fixed a few typos. Added a sentence in the georeference bullet of the effect of images taken at an angle to the earth's surface.
Merge pull request #68 from TomT5454/patch-1

Update 0200-12-22-arerial-imagery-considerations.md
Use integers for ordered bullet list rendering
Merge branch 'gh-pages' into french