Update and simplify README

[ghost]

This PR updates and simplifies the README. In particular, I've updated the build instructions to just mention npm install. I've removed some extra commentary in the README that I think might be better suited to the wiki or other docs. If you find this PR acceptable I could help add the commentary (licensing, status) to the wiki and include links in the README.

[coveralls]

Coverage remained the same at 50.731% when pulling 0d7edb5 on freebroccolo:update-readme into 0212ef6 on bloomberg:master.

[coveralls]

Coverage remained the same at 50.731% when pulling 0d7edb5 on freebroccolo:update-readme into 0212ef6 on bloomberg:master.

[coveralls]

Coverage remained the same at 50.731% when pulling 57ca44b on freebroccolo:update-readme into 0212ef6 on bloomberg:master.

[coveralls]

Coverage remained the same at 50.731% when pulling 23fc796 on freebroccolo:update-readme into 0212ef6 on bloomberg:master.

[bobzhang]

node is not a dependency, if people build from source, and we don't depend on c++ toolchain

[ghost]

Good points. The reason I put Node there is because it comes with npm but I could clarify that (when installing the package) and fix the other one.

[bobzhang]

I like the new README in general, it looks more professional, sorry for my bad English :-)
Some comments posted

[ghost]

Thanks. Regarding the licensing and building from source sections, what do you think about moving them to a separate markdown file or a wiki page and just have a very clear link under the section header?

I think it's great to make the extra information available but maybe not include all of it directly in the main README. I worry that seeing all the detailed build instructions right away could be intimidating to users who don't plan to work on the source.

[bobzhang]

I agree, would you mind have a file in docs about building instructions?
Let's keep the Licensing section here, it needs more careful review to move such stuff, thanks!

[ghost]

@bobzhang I updated the PR based on your feedback. The build instructions are in an external file and the license section is added back in (I tried to restructure some of the links and stuff to make it a bit clearer but can revert that part if you prefer).

[coveralls]

Coverage remained the same at 50.731% when pulling 0753f79 on freebroccolo:update-readme into 9c327d6 on bloomberg:master.

[coveralls]

Coverage remained the same at 50.731% when pulling e0fb4b6 on freebroccolo:update-readme into 9c327d6 on bloomberg:master.

[bobzhang]

Thanks, looks much better now. Except for the explanation of bs attributes, with bs attribute, the compiler would guarantee to generate code following uncurried calling convention (required by FFI from JS side), without bs attribute, the compiler has freedom to optimize.

[ghost]

Okay, does that part look better now?

[coveralls]

Coverage remained the same at 50.731% when pulling 2efb762 on freebroccolo:update-readme into 9c327d6 on bloomberg:master.

[coveralls]

Coverage remained the same at 50.731% when pulling 2efb762 on freebroccolo:update-readme into 9c327d6 on bloomberg:master.

[bobzhang]

thanks!