This bar can only be displayed only in a html page

A action controller can generate a different content type as XML. Currently, we must disable the toolbar by hand using the disable parameter.
Remove trailing whitespaces and fix multi database headers.

Remove trailing whitespaces.
Fix multi databse headers.
added Constants plugin
fixed some wrong html
Merge pull request #16 from soundczeck/master

Removed traling whitespaces and fixed multi database headers in tab.
Merge pull request #11 from phpid/patch-1

Fix the 'undefined variable' notice
Merge pull request #15 from b-durand/feature/content-type_detection

This bar can only be displayed only in a html page
Merge pull request #17 from axhm3a/master

added Plugin for User Constants
Fixed content type detection

Only skip output if contentType is set and not html
Update library/ZFDebug/Controller/Plugin/Debug/Plugin/Html.php
Update library/ZFDebug/Controller/Plugin/Debug/Plugin/Text.php

Spelling: paran -> param
Merge pull request #18 from rhynodesigns/master

Spelling: paran -> param
user defined constants are to sorted alphabetically now
Merge pull request #23 from axhm3a/master

user defined constants are to sorted alphabetically now
Added support for Zend OPcache

PHP 5.5 includes Zend OPcache by default, so the cache plugin has been
updated to display quick statistics
Removed debug code
Version bump
Updated README
Updating deprecated files

Memory, Registry and Time have been removed. They have been deprecated
for a long time and are replaced by the Log and Variable plugins.

Constants plugin is now deprecated as well and functionality has been
moved to Variables.
Add support for composer dependency management tool