Merge pull request php-debugbar#111 from barryvdh/patch-6

Add title to variable keys

avoid triggering error if hljs is not loaded (fixed php-debugbar#107)

added missing fonts (fixed php-debugbar#106)

removed unneeded files in vendor assets

code conventions

added syntax highlighting (fixed php-debugbar#99)

renamed DataFormater to DataFormatter (oups!)

updated docs and changelog

better handling of long keys in kvlist (fixes php-debugbar#61)

Merge pull request php-debugbar#88 from Metallizzer/master

Timeline widget.