Update understanding-model-view-controller.rst
Merge pull request #1460 from Jippeh/patch-1

Update understanding-model-view-controller.rst
Move info about counter cache below the section for belongsTo.
Merge pull request #1461 from ADmad/countercache

Move info about counter cache below the section for belongsTo.
Remove wacky invisible character.
Remove non utf8 character.
Update data-validation.rst

Attempt #2 to make the sentence clearer.
Update data-validation.rst

Correct a grammar error from "ways" to "way"
Update data-validation.rst
Merge pull request #1467 from lordg/patch-2

Update data-validation.rst
Clarify return $this
fix spaces
Merge pull request #1468 from dereuromark/master-return-this

Clarify return $this
Update advanced-installation.rst

fixes installation path.
Merge pull request #1469 from nojimage/patch-1

Update advanced-installation.rst
Fix grammar in data validation