Add pre commit hook for linting

[muralikrishna8]

Need to add the pre-commit hook for running the eslint --fix just for the changed files. That should:

• run eslint only for the staged files
• run eslint --fix

But for that we need to make some changes to the way we have our lint configured. Either we can find a way to do it with the gulp, or we can just use the eslint command directly without having the gulp task.

[muralikrishna8]

Added pre commit hook for running the eslint --fix for the staged .js and .jsx files using lint-staged