Add Gemfile.lock parsing for dependency parser

[khasinski]

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Dependency parsing for #1686

Uses Bundler gem for parsing, parses only name for now, we should probably extract URL for repos.

Description

Related Issue

• #1686 Gemfile.lock, more languages to come, stay tuned ;)

Motivation and Context

An initial stub to get the dependency parsing running

How Has This Been Tested?

• invalid file + a tiny Gemfile.lock, might need more testing

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[schneems]

Any updates? This was pretty close to over the line.

[khasinski]

Hey, I'll finish it up today