refactor(cleanup): font + templates + images
refactor(css): remove old stylesheets
refactor(cleanup): js libs version, clean gulpfile

 - bump gulp plugins js versions
 - clean task now use the del node package
 - fix images minification task, exclude svg files
 - add gulp-plumber
Merge branch 'dev' of github.com:LateralThoughts/lateralthoughts.github.com into dev