Added Tuple#new. Related to #213
Make sure to remove subclass observer before adding a new one
Use `require "http/client"`, `require "http/server"` instead of `require "net/http"`... Related to #279
Refactor Projecfile management
deps: guess project name using some conventions
deps: check command errors
deps: initial, very naïve way to do `update`
Added experimental iterator
Rearranging math files
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:scidom/crystal