BlueScreen: shortened depth for dumped variables in source code
templates: require replaced with readfile() & file_get_contents()
BlueScreen::highlightPhp() removed &nbsp;
Dumper: resources are dumped with #id
whitespace, simplified doc comment
create-phar: added minification for JS & CSS
templates: removed unused class .tracy-alt and table

Conflicts:
	src/Tracy/templates/bar.errors.panel.phtml
added contributing.md
bar.js: closing of windows is detected in beforeunload instead of unload, to make it work in IE
Query.js show() removes created element
travis.yml: tested under PHP & PHP-CGI
tests: typo