Update JS version usage information

[flbulgarelli]

We must update:

• npm install samples
• node usage samples as library code
• node usage samples as standalone program
• deployment instructions
• ghcjslib README

[flbulgarelli]

See #207 (comment)

[flbulgarelli]

PS: I am not being able to run mulang-cli

[julian-berbel]

PS: I am not being able to run mulang-cli

aaaagggghhhhhhh. Apparently the package bin doesn't assume the given files are js files to be run with node, but rather it should take files that are directly executable by the os (we just need to add #!/usr/bin/env node at the beginning of the file) ((also, the require path is wrong, when deployed both mulang-cli and mulang are in the same folder, so it should not have build/ in it))

[julian-berbel]

Maybe it would be better to keep the same directory structure between the published package and development, since adding the aforementioned changes to the index.js file would then fix the published version, but break development