Various documentation fixes

Signed-off-by: Dries Vints <dries.vints@gmail.com>
Remove duplicate lists function from Eloquent Collection

Signed-off-by: Dries Vints <dries.vints@gmail.com>
Merge branch '4.0'
set grammar table prefix when prefix is set on connection.
Merge branch '4.0'
Merge pull request #1535 from driesvints/feature/lists-function-on-collection-class

Add lists method to Collection class
Merge branch '4.0'
Add implode method to Collection class and Query Builder

This makes it easy to glue values or column or key inside a collection or a DB result set together.

Signed-off-by: Dries Vints <dries.vints@gmail.com>
Cleaning up some code.
Merge branch '4.0'