Add a chain method

[vitormcruz]

So that one can use:

(1 2 3 4 5 6 7 8 9) chain select: [ :num | num even ];
                                       collect: [ :a | a / 2].

instead of:

((#(1 2 3 4 5 6 7 8 9) select: [ :num | num even ])
collect: [ :a | a / 2]).

If interesting, I have an implementation that uses Avatar that I can provide. The downside is that they don't have a proper baseline, so I had to fork the project in order to add one, issued a pull request, but up until today they did not integrated it: guillep/avatar#14

[gcotelli]

Looks like a nice addition. Given that this library is a dependency of all the others in the ba-st ecosystem we are extra careful with adding dependencies. We need to take into account that if we're going to depend on another library we want some minimal things from it:

• A working CI setup that runs the library tests
• Alignment with the supported Pharo versions
• A sane release policy, so we can depend on versions or branches where breaking changes are clearly identified so our build doesn't stop working for external reasons

[vitormcruz]

Problem is that the best implementation I came up so far was using avatar (it is fast, general and easy to understand). I don't see they working on it anytime soon since they didn't answered my requestb and I know some of them are busy with other projects.

Do I create a CI in my fork anyway with a release so to frozen something more or less stable? Another alternative is incorporate avatar into buoy, but I don't know if it is interesting or if the original author would be ok with it.