…eme-colors

Allow many theme colors

use undefined rather than 0 or center.

Exemple of usage :
```
        $('table.highchart')
          .on('highchartTable.cleanValue', function(value, options) {
               if (options.indexTr == 0) {
                 options.value = options.value.replace(/\$/, '');
               }
          })
	  .highchartTable()
```

List of options passed to the event :
* value (that's the one that must be changed, contains the value already cleaned by HighchartTable)
* rawValue : the value not cleaned by HighchartTable
* td : jQuery objet of the td were the valued is extracted from
* tr : jQuery objet of the tr where is td is readed from
* indexTr : index of the tr (starts at 0)
* indexTd : index of the td (starts at 1)

add first tests on highchartTable

`data-graph-yaxis-X-*` attributes doesn't work
on jQuery 2 (but `data-graph-yaxisX-*` work).
`data-graph-yaxis-X-*` works on the master branch
of jQuery.

In order to have a version that work on all
jQury versions we have to support the `data-graph-yaxisX-*`
version that will be the new norm.

To avoid a Backward compatibility break, we need to
support both versions of the attribute.

* Now all `data-graph-yaxis` attributes could be written
with or without a dash before the axis number.
* There is tests on all the attributes, in both versions
* tests are executed on both jQuery 2 and jQuery 1

see issue highchartTable#60

Conflicts:
	.travis.yml

fix yaxis attributes on jquery2

add event to customize cleaning of cell values

xaxis label autorotation fix

rich the information of package.json