adding correct sample.osm location
updating gps chapter and fixing missing images
a few edits to field papers chapter
Merge pull request #133 from jeffhaack/gh-pages

updated gps chapter and a few edits to field papers chapter
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

Conflicts:
	_posts/en/0200-12-24-papers.md
	_posts/en/0200-12-26-gps-1.md