Merge pull request #2091 from jgable/sandboxApps

Load Apps Sandboxed
Fixing App unit test on Windows

- switched test from exact string to regex to match both types of paths
Replace underscore with lodash.
Merge pull request #1536 from jdalton/lodash
Install App Dependencies

- Spawns an npm install command from the App root
- Has some special OS checks for windows command spawning