Update Filesaver.js to the latest git (2014-01-24).
Update jszip to the latest git (https://github.com/Stuk/jszip/commit/202003821ddd1b5295ddec23ed8e421464bc0c44).
Update less.js to v1.6.2.
Merge pull request #12572 from XhmikosR/master

Gruntfile.js: Move common uglify properties together.
Merge pull request #12570 from XhmikosR/libs

Update docs libs