Fixed coverage config
fixing assignment bug in model isset method
[4.2] Fix Query Builder GroupBy Method Doc Block
Merge pull request #6735 from dbwhddn10/4.2

[4.2] Fix Query Builder GroupBy Method Doc Block
Merge pull request #6725 from janhartigan/4.2

Fixing assignment bug in Eloquent model isset method
Remove useless check on $glue argument
Missing using breaks the "extend" method
Merge pull request #6743 from ash-rain/patch-1

Missing using breaks the "extend" method
Remove extra line.
Merge pull request #6740 from lucasmichot/4.2-support-collection-implode

[4.2] Support : remove useless check on $glue argument
Merge pull request #6742 from GrahamForks/4.2-phpunit

[4.2] Fixed Coverage Config
fix conflicts.