add jasmine tests for weekly dtick get tick0 on Sunday
add jasmine tests for weekly dtick get tick0 on Sunday

plotly/plotly.js,aburato/plotly.js,aburato/plotly.js,etpinard/plotly.js,plotly/plotly.js,plotly/plotly.js,etpinard/plotly.js,plotly/plotly.js,etpinard/plotly.js