prevent package.json changing when calling oc dev

[dipunm]

This addresses issue #796.

Since npm made --save the default behaviour, oc has been modifying the package.json file accidentally. This ensures that the package.json file remains untouched.

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Explain the details for making this change. What existing problem does the pull request solve?

Test plan (required)

Create a new project using oc init hello-world and then delete the following folders if they exist: node_modules, _package.
view the component's package.json file:

  "devDependencies": {
    "oc-template-es6-compiler": "1.1.8"
  }

Now run oc dev .
Notice that the package.json file changed:

  "devDependencies": {
    "oc-template-es6-compiler": "^1.1.8"
  }

Now apply this fix.

Notice that the package.json file remains unchanged.

Closing issues
closes #796