Limit backtrace frames to return
Adding getGuarded() getter.

Is there any particular reason why this one has not been created initially?
Various database fixes
Fix the docblock for constructor
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
[4.2] Fix Query Builder GroupBy Method Doc Block
fix conflicts.
Merge pull request #6725 from janhartigan/4.2

Fixing assignment bug in Eloquent model isset method
fix conflicts.