beautify code with jslint
rewrite onclick function with better code
wrap onclick events in an anonymous function
remove unnecessary escape
use function form for 'use strict'
bring dot operator to preceding line
add new library 'math.js'
switch to math.js evaluation function
handle calculation errors
add button to cancel everything
improve slider
fix logarithm substitution
Merge branch 'mathjs'
reduce memory usage
Merge branch 'master' into gh-pages