gauge.step should not be used in js template

[Soumya Swaroop Gupta]

Expected behavior
When user uses gauge init js it should not generate statements that are deprecated

Actual behavior
gauge implementation has gauge.step instead of using step

Steps to replicate

• gauge init js
• Open the step_implementation.js to see the usage gauge.step

[Zabil Cheriya Maliackal]

#13