Improve pulp init to pulp publish workflow

[Risto-Stevcev]

pulp init doesn't provide enough metadata in order to publish a package. The problem is that once a tag gets pushed, say v1.0.0, if the author discovers that there's some metadata missing (like a license or repo field in bower.json), then they have to push a new version v1.0.1, which is ugly and feels like overkill just because some metadata was missing.

Issues #284 and #271 could help with some of this

I think the easiest/cleanest solution is to add additional functionality to pulp init:

• pulp init will always prompt the license and repository fields for bower.json, since they're necessary for publishing packages.
• If there's a LICENSE file in the project root, then pulp init reads it and tries to determine which open source license it is and offers that as the default for the prompt.
• It'll also prompt which name to use in the license, and pulp will read git config user.name and provide that as the default name.
• Pulp will use git remote get-url origin as the default repository url if there's a git repo in the project root

That way the workflow would just be:

• Create a github repo, choose a license, and clone it
• Run pulp init in the project root and just press enter a few times since it'll provide the right defaults