Remove menu icons due to @melchoyce Dashicons

In @WordPress 3.8+ dashboard icon font is now included within core.
To use a Dashicon, pass the name of the helper class, e.g. 'dashicons-piechart'.

WordPress changelog: http://core.trac.wordpress.org/changeset/26664
WordPress/WordPress@9b29ad0529e11e9eeb426c50ad4a3b06b1d214b7

List of icons: http://melchoyce.github.io/dashicons/

*Sublime Text has removed some whitespace and unnecessary line-breaks, nothing but the menu icon functions are removed (no worries).*