removed the note about restrictions on creating new EAV entries
Update eav.html

Extending model_to in related models
Correcting small typo errors
Merge pull request #613 from kay899/1.8/develop

Update eav.html
Update eav.html

Correcting typo errors
Update usage.html

https://github.com/fuel/docs/issues/615
Update db.html
Merge pull request #616 from EmRa228/patch-1

Update usage.html
Merge pull request #617 from EmRa228/patch-2

Update db.html
change vales to values
Merge pull request #618 from EmRa228/patch-3

change vales to values
Merge pull request #614 from kay899/1.8/develop

Update eav.html
Wrong example for ORM pagination
Merge pull request #619 from kesali/1.8/develop

Wrong example for ORM pagination
Added docs for mailgun library
Merge pull request #620 from alrik11es/1.8/develop

Added docs for mailgun library
documented new download() parameter
added File::exists(), a file exist check that honours the defined area.
Add docs for oil's "generate module"

Signed-off-by: Philipp Tempel <phtempel@gmail.com>
Merge pull request #621 from philipptempel/patch/oil_module_support

Add docs for oil's "generate module"
Added Arr::keyval_to_assoc docs