Added php 5.6 to travis
WhoopsDisplayer and PlainDisplayer should honor the HttpException's headers
Merge pull request #3520 from GrahamCampbell/travis

Added PHP 5.6 To Travis
Merge pull request #3521 from sirbarrence/displayers-ignore-headers

exception displayers should not ignore custom headers
Fix spacing.
add getters for Blade's contentTags and escapedContentTags
Merge pull request #3535 from blazeworx/get-content-tags

[Proposal] add getters for Blade's contentTags and escapedContentTags
Blank line at eof
Merge pull request #3540 from GrahamCampbell/eof

A Few Trivial EOF Tweaks
Fix caller bug.
Fix job retry bug with attempts.
Merge branch '4.1'