Merge pull request #32 from ulilicht/develop

Fixed Bug #31 from https://github.com/maxklenk/angular-chart/issues/31
Exposed the resize() function of c3
fixes problem with last commit. (99f2fdeabac0590112f81b166ea15b672ac1c96c)
Merge branch 'develop' of https://github.com/ulilicht/angular-chart into develop