add jasmine tests for various tickformat using period mode
add jasmine tests for various tickformat using period mode

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