Support npm CLI 3.x

[cpetrov]

Package dependencies are now installed in the root "node_modules" directory when possible.

[angelozerr]

@cpetrov I'm sorry, but I don't understand very well your PR? It seems that yoru PR contains too changes of PR #33 and why have you changed the path of acorn inside HTML page demo?

Before acorn was declared in the package.json. Now it is not declared because it must be the same acorn version than tern.

I suggets you that you remove your node_modules and do npm install.

[cpetrov]

With npm version 3.x (npm -v) npm package dependencies are installed to the root node_modules when possible. acorn is a dependency of tern and with npm 3.x it is now installed to tern-tabris/node_modules instead of tern-tabris/node_modules/tern/node_modules.

[angelozerr]

Ok I understand, but I think we should provide simple demo: user does just npm install (without some option) and it works directly. Are you agree with me?

[cpetrov]

Bundling required dependencies with a tool like Browserify may be an option?

[angelozerr]

As I said you, I woud like to have a simple thing. Just do "npm install". Demo is just to play with them, that's all.

[cpetrov]

Users would still have to npm install without specifying any arguments, but dependencies structure would only be compatible with the newer npm 3.x which introduced the flatter dependency structure.

Before this PR doing npm install with the new 3.x npm version would result into the acorn dependency not being found, as it is not placed nested inside tern's node_modules anymore, but is inside tern-tabris' node_modules.

This change would however break dependency structure for users with older npm versions (<3.x). That's why I thought dependencies could be alternatively bundled to make the demo easier to consume without relying on a specific version of the globally installed npm.

Do you have any other ideas? I hope I understood you right :)

[angelozerr]

@cpetrov I have installed last version of node.js https://nodejs.org/en/download/ which is v4.2.1 and which provides npm 2.14.7. I don't know how to install npm 3.x. Is it an official version?

[angelozerr]

After finish this PR, can I create a release?

[cpetrov]

@angelozerr Sure!

LTS includes 2.14.7, Stable (https://github.com/nodejs/node/blob/v5.0.0/CHANGELOG.md) includes 3.3.6. LTS is the default option when downloading Node.js though. Should we wait until npm is also updated for LTS?

[angelozerr]

Should we wait until npm is also updated for LTS?

Yes I prefer waiting.

Do you know if there is an option with npm < 3.x which does the same thing than npm 3.x?

@angelozerr Sure!

Release 0.4.0 was done.