Adding raw intermediate "edit in detail" chapter + images

Proof reading needed!
revised intermediate adv. editing for grammar
Merge pull request #77 from skorasaurus/intermediate

revised intermediate 'editing in detail' page for grammar
First row version of intermediate "Conflict Resolution" chapter

Images included.
Proof reading needed!
Use italic for captions in "Conflit Resolution"
First raw version of "Quality Assurance" chapter, including images

Need proof reading.
Add a dummy Intermediate's guide introduction, to be filled
Add proper Intermediate Guide introduction
Prepare for French translation of intermediate guides
Change French intermediate guides metadata
Adding Orbview Imagery Material
Added Editing the Wiki Material
Added Tasking Manager Material
Merge branch 'intermediate' into gh-pages
First shot of French version of "edit in detail" (by @pierzen and @severinmenard)

Email and copy/paste powered workflow :p
Merge branch 'adissadis-intermediate' into gh-pages
Update French dummy "editing-wiki" page according to new English one
add serve/ in gitignore
review intermediate metadata
Merge branch 'gh-pages' of https://github.com/hotosm/learnosm into gh-pages