dependency-graph

Is your feature request related to a problem? Please describe.
Add a rule that fails when unstable package is used (e.g foo@1.0.0-alpha)

We currently only run cargo build, cargo doc and something like cargo fmt --verify on CI. We also need to run the unit tests now that we have them, via cargo test.

Options > Code > Saving

• Ensure that source files end with newline
• Strip trailing horizontal whitespace when saving

Describe the bug
When I try to execute the quickstart guide under windows (via the mingw git bash) the .\jarviz produces the following error:

java.io.IOException: Cannot run program "mvn": CreateProcess error=2, The system cannot find the file specified

To Reproduce
Just follow the quickstart guide under windows.

• Jarviz version: 0.1.7
• Java version: 1.8.0

**Expec