Merge pull request #235 from cake17/3.0

update coding standards
arrow usage addition
Merge pull request #236 from antograssiot/3.0-keyboard-arrow

3.0 keyboad arrow usage addition
Moving cakephp to the require section in composer.json
Merge pull request #237 from cakephp/fix-composer

Moving cakephp to the require section in composer.json
Make active request indicator persistent.

Fix state being lost when the history panel is closed and reopened.
Fix incorrect URL being used for current request.

Whoops.
Update the summary when updating the toolbar.
Add visual indicator for history mode.

Add additional visual indicators for entering and leaving history mode.
Remove dead code.
One test is ok, multiples cause issues.
Collapsing tests allows them to pass on MySQL.

Apparently saving only one toolbar does not enrage MySQL.
Remove unused variable.
Merge pull request #239 from cakephp/history-fixes

History fixes
Add request method to history panel.

Display a request's HTTP method in the history output.
Merge pull request #241 from cakephp/history-show-method

Add request method to history panel.
3.0 add warning when headers has been sent
fixing tests
Fixed data interpolation in translated stirng
Merge pull request #242 from cakephp/3.0-headers-warning

3.0 add warning when headers has been sent