use mergeAttr in axis editing, remove defaultAxis, fix axis edit bugs
use mergeAttr in axis editing, remove defaultAxis, fix axis edit bugs

plotly/plotly.js,iongroup/plotly.js,etpinard/plotly.js,plotly/plotly.js,plotly/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,iongroup/plotly.js,aburato/plotly.js,asolagmbh/plotly.js,iongroup/plotly.js,etpinard/plotly.js,aburato/plotly.js