GUI-compilers-that-use-LESS.js.md: fixed some screenshot links.
usage/Editors-and-Plugins.md: added some new, updated a few old links
usage/Editors-and-Plugins.md: a few more fixes
usage/Editors-and-Plugins.md: a yet more
Merge pull request #54 from seven-phases-max/master

Updated Editors-and-Plugins and GUI-compilers-that-use-LESS