Allow using netman without installing lxml

[internap]

Allow using netman without installing lxml

[lindycoder]

I like the idea of a core and separate packages for models

[fbouliane]

I like the core package and switches package as well.
The only problem I see with it is the difficult workflow that comes with it. How do I version those packages ? How do I push to travis and pypi multiple package if I have a single repo? I can use multiple repo but then it's complicated on the developer side ....

The other thing is that moving to another package format has some backward compatibility issue.
Something like the following would ensure a easy installation for everyone ... we'll see
netman -> [netman-core, netman-juniper, netman-dell, etc...]

As a workaround to make the project more easily accessible, I suggest that we make sure dependencies are not pinned in the setup.py/requirements.txt . This will allow people to reuse their current environment and be compatible with more projects.

PR #192 should be a step in the right direction, and allow you to remove your pip install hack

[mat128]

I agree with your points, Felix. Having a meta netman package that depend on the splitted packages would allow for a smooth transition.

For the record, you can have multiple python modules in the same tree and I think you can publish them separately (subfolders with their own setup.py/setup.cfg is one way it would work).

[fbouliane]

Just had a vm that didn't install lxml because it takes more than 512MB of ram to compile lxml.
That library seems to be a recurrent problem :/