Resolve folder name conflicts in View, app to App, remove sections of deleted classes.
Merge pull request #765 from dereuromark/3.0-view

3.0 view
Added info about more removed classes/methods.
Update part-two.rst

Small identation fix
Merge pull request #769 from williamn/patch-2

Update part-two.rst
Merge pull request #768 from ADmad/3.0

Added info about more removed classes/methods.
Added info about "text/plain" to "csv" mapping removal.
Merge pull request #789 from ADmad/3.0-response

Added info about "text/plain" to "csv" mapping removal.
Fix pluralization.
Merge branch '3.0' into 3.0-paginator

Conflicts:
	en/appendices/3-0-migration-guide.rst