Merge pull request #6702 from janhartigan/4.2

Allowing for camel and studly-cased mutator attributes
Fix spacing.
Add a cache of snake, camel, and studly cased words.
Fix method name.
Correct a little spelling mistake
Limit backtrace frames to return
Adding getGuarded() getter.

Is there any particular reason why this one has not been created initially?
Various database fixes
Added a missing new line
Fix the docblock for constructor
Revert "[4.2] Allows Arr::only To Handle Dotted Keys"
Merge pull request #6717 from laravel/revert-5746-4.2-array-only-dotted

Revert "[4.2] Allows Arr::only To Handle Dotted Keys"
Merge pull request #6708 from RomainLanz/4.2

[4.2] Correct A Little Spelling Mistake
Merge pull request #6710 from JamShady/pull-request/micro-optimisation

[4.2] Limit Backtrace Frames To Return
Merge pull request #6709 from GrahamForks/4.2-fixes

[4.2] Various Database Fixes
Merge pull request #6711 from Claymm/patch-3

[4.2] Added getGuarded()
fixing assignment bug in model isset method