Fix one plugin display from side bar in home page

graph.js: change the jQuery selector to catch the right element,
    pretify javascript
Fix plus and minus classes

In the side bar plus and minus buttons were broken,
    jQuery toggleClass was not used correctly, hide function was fixed
    too.
Cleaning up stuff in numeter

    - remove unused minified files
    - jslint compliant dygraph-numeter.js and graph.js
    - fix some js function which are using weird variable scope,
variables have been added to parameters to be correctly handled.