Add Parameters to Route Closures

Use 'HttpKernel\Controller\ControllerResolver::getArguments' to get the
parameter arguments mapped properly to the closure function arguments

Function arguments must have the same name as the route parameters but
can be in any order.
PSR-2 Formatting
Add some docs for route params
Fix npm install instructions in README
Properly escape file names, titles, and descriptions

Hacker One report# 30019
If the languages folder doesn't exist scandir fails, check if it exists
Fix delete SQL statement
Merge pull request #1271 from Mnkras/hotfix/cli-languages

If the languages folder doesn't exist scandir fails, check if it exists
Merge pull request #1264 from mkly/add_some_docs_for_route_parameters

Add some docs for route params
Merge pull request #1263 from mkly/add_parameters_to_route_closures

Add parameters to route closures
Merge pull request #1265 from mkly/fix_npm_instruction_readme

Fix npm install instructions in README
Merge pull request #1270 from Mnkras/hotfix/hackerone-30019

Properly escape file names, titles, and descriptions
Merge pull request #1273 from rgrochowicz/develop

Fix delete SQL statement