835939 - Data usage graph scaling should adjust at regular intervals

Status: RESOLVED DUPLICATE of bug 835940

(Firefox OS Graveyard :: Gaia::Cost Control, defect)

Description

[marcoc]

The data usage graph should scale and adjust at regular intervals to allow better legibility and consistency of visualization. 
current - Currently the graph automatically scales based on the data alert level set by user, and if this number is not even, the graph scales itself in irregular increments that are difficult for a user to understand. 
expected:
- Graph always maintains a regular scale, meaning the numbers on the side always represent an  even scale with round numbers.
- When data level goes beyond the highest limit, the graph adds one horizontal line on top and scales itself to fit the data.
- There should be a maximum of 7 horizontal lines allowed, beyond which the graph goes back to 4 lines and numbers change on the sides.