consistent img naming convention and organization

edit of English version
(intention is to make process of creating a new translation easier)

images:
- consistent use of reference style image syntax in chapters
- language subfolder within images folder
- file naming convention:
	en_beg_[two digit chapter #]_
	[chapter name based on permalink]_
	image[two digit # code]_
	[image name based on image reference id]

other:
- link in CONTRIBUTING.md updated to skip a redirect
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
corrections to img file names
corrections to img file paths

removed {{site.baseurl}} in image paths
reworked the beginner chapters
minor revisions
putting images into directory structure
updates and revisions
bringing more tools section up to date
updates/improvement to presets chapter
converted custom presets chapter and edited for greater simplicity
edits to multipolygon section
finish relations chapter
updating imagery chapters
edits to conflict resolution
add iD editor chapter
work on export chapter
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

https://github.com/jeffhaack/learnosm

Conflicts:
	_posts/en/0200-12-22-arerial-imagery-considerations.md
	_posts/en/0200-12-23-editing-with-josm.md
	_posts/en/beginner/0200-12-20-beginner-all-chapters.html
	_posts/en/beginner/0200-12-24-papers.md
	_posts/en/beginner/0200-12-26-gps.md
	_posts/en/beginner/0200-12-28-start-josm.md
	_posts/en/beginner/0200-12-29-start-osm.md
	_posts/en/beginner/0200-12-30-introduction.md
	_posts/en/editing/0400-11-29-josm-plugins.md
	images/Homepage.png
	images/asd.png
	images/beginner/ch6-field-papers/Homepage.png
	images/beginner/ch6-field-papers/asd.png
	images/beginner/ch6-field-papers/blackandwhite.png
	images/beginner/ch6-field-papers/choosetile.png
	images/beginner/ch6-field-papers/downloadpdf.png
	images/beginner/ch6-field-papers/editinidorpot.png
	images/beginner/ch6-field-papers/fsnapshot.png
	images/beginner/ch6-field-papers/labelnext.png
	images/beginner/ch6-field-papers/layout.png
	images/beginner/ch6-field-papers/makeatlas.png
	images/beginner/ch6-field-papers/makeyourselfanatlas.png
	images/beginner/ch6-field-papers/name.png
	images/beginner/ch6-field-papers/preparingyouratlas.png
	images/beginner/ch6-field-papers/scannedmap.png
	images/beginner/ch6-field-papers/scrnsht.png
	images/beginner/ch6-field-papers/upload.png
	images/beginner/ch6-field-papers/uploadfp.png
	images/beginner/ch6-field-papers/watchsnapshot.png
	images/beginner/ch6-field-papers/zoominout.png
	images/blackandwhite.png
	images/choosetile.png
	images/downloadpdf.png
	images/editinidorpot.png
	images/en/en_beg_06_field-papers_image00_homepage.png
	images/en/en_beg_06_field-papers_image04_makeatlas.png
	images/en/en_beg_06_field-papers_image05_makeyourselfanatlas.png
	images/en/en_beg_06_field-papers_image06_zoominout.png
	images/en/en_beg_06_field-papers_image07_choosetile.png
	images/en/en_beg_06_field-papers_image08_blackandwhite.png
	images/en/en_beg_06_field-papers_image09_zoom.png
	images/en/en_beg_06_field-papers_image10_labelnext.png
	images/en/en_beg_06_field-papers_image11_name.png
	images/en/en_beg_06_field-papers_image12_layout.png
	images/en/en_beg_06_field-papers_image13_preparingyouratlas.png
	images/en/en_beg_06_field-papers_image14_downloadpdf.png
	images/en/en_beg_06_field-papers_image15_scrnsht.png
	images/en/en_beg_06_field-papers_image16_upload.png
	images/en/en_beg_06_field-papers_image17_uploadfp.png
	images/en/en_beg_06_field-papers_image18_asd.png
	images/en/en_beg_06_field-papers_image20_watchsnapshot.png
	images/en/en_beg_06_field-papers_image22_scannedmap.png
	images/en/en_beg_06_field-papers_image23_fsnapshot.png
	images/en/en_beg_06_field-papers_image24_editinidorpot.png
	images/fsnapshot.png
	images/labelnext.png
	images/layout.png
	images/makeatlas.png
	images/makeyourselfanatlas.png
	images/name.png
	images/preparingyouratlas.png
	images/scannedmap.png
	images/scrnsht.png
	images/upload.png
	images/uploadfp.png
	images/watchsnapshot.png
	images/zoominout.png
Merge pull request #134 from danbjoseph/gh-pages

img naming convention and organization
Merge pull request #135 from nebulon42/gh-pages

Fixed issues with sticky nav and mobile version