Install PM2 module from Github's non-master branch

[ma-zal]

Installation of PM2 module from GitHub's non-master branch is failing.

Problem is, that PM2 is expecting, that final NPM module directory will be module#branchname, but real is without #branchname of course. So the PM2 finally stores the wrong name to module_conf.json -> module-db object.

Example:
pm2 install ma-zal/pm2-slack#own-customization

[PM2][Module] Installing module ma-zal/pm2-slack#own-customization
[PM2][Module] Calling [NPM] to install ma-zal/pm2-slack#own-customization ...
--- skiping some lines here ---
/home/nodejs/.pm2
└─┬ [email protected]  (git+https://github.com/ma-zal/pm2-slack.git#cee398d0ce8aeac02222a9686532331aff4bbd51)
--- skiping some lines here ---
[PM2][Module] Module downloaded
module.js:471
    throw err;
    ^

Error: Cannot find module '/home/nodejs/.pm2/node_modules/pm2-slack#own-customization/package.json'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at startModule (/usr/lib/node_modules/pm2/lib/API/Modules/Modularizer.js:33:22)
    at /usr/lib/node_modules/pm2/lib/API/Modules/Modularizer.js:158:9
    at /usr/lib/node_modules/pm2/lib/Configuration.js:64:14
    at FSReqWrap.oncomplete (fs.js:123:15)

pm2 --version
2.4.3

[vmarchaud]

We should add something here to trim the name

[Unitech]

@ma-zal looks like a quick fix, feel free to open a PR on this
Basically we just pass arguments to npm