Koa Nunjucks Class

@param {object} oCtx - Koa Context
@param {string} [sPath] - Path string
@param {object} [oOpts] - Options
@constructor
function KoaNunjucks(oCtx, sPath, oOpts) {

    // Configure Nunjucks
    this.enviornment = nunjucks.configure(sPath, oOpts);

    // Save context
    this._ctx = oCtx;
}