Merge pull request #1 from lekhmanrus/angular

initial assets
Merge pull request #2 from lekhmanrus/master

simple interface
Merge pull request #4 from lekhmanrus/angular

mathjax svg rendering
Update README.md
integration with libsymath
merge from 'lekhmanrus/symath-application'
MathJax as gitmodule
error displaying
'clear input' feature
browser-friendly libsymath
full cycle grunt build
add web server, fix docs