fixed broken foreach in 0.5

[dioptre]

No description provided.

[dioptre]

added your old demo code and created a plugin to share Javascript (JSON) betwen non escher components

[dioptre]

reverted update for 0.5 as broke 0.4

[dioptre]

Hi @shashi I removed the attempted fix for 0.5 but there's a json webcomponent in the pull request that'd be great to include in the base - i'll be adding another raw component soon too

[shashi]

Could you tell me how you are using the json-mirror component?

This PR does many things, can you make it do just one, and open more PRs for other things?

[dioptre]

hi i simplified it in the next pr

the json acts as a mirror between client and server - which both can bind to - very flexible, and for components not supported by escher or polymer out of the box - ill be using this

[MichaeLeroy]

This PR came to my attention because I ran into the issue of Escher choking on foreach. This occurs because foreach is used in both Reactive and Compat:

mike@harlan:~/carly/home-raw/escher$ escher --serve
Listening on 0.0.0.0:5555...
WARNING: both Reactive and Compat export "foreach"; uses of it in module Main must be qualified

Perhaps I see this error because I've gotten a bit ahead of the stable version of the 0.4 release:

julia> versioninfo()
Julia Version 0.4.6-pre+18
Commit 198644a (2016-04-01 03:37 UTC)
....

Possibly users with an older version have not yet seen this issue.

The conflict suggests that an alternative (to that of @dioptre) fix of the problem with foreach is to qualify it as Reactive.foreach:

mike@harlan:~/.julia/v0.4/Escher/src/cli$ git diff serve.jl
diff --git a/src/cli/serve.jl b/src/cli/serve.jl
index ea9d1a1..19f3745 100755
--- a/src/cli/serve.jl
+++ b/src/cli/serve.jl
@@ -158,7 +158,7 @@ uisocket(dir) = (req) -> begin

     window = Window(dimension=(w*px, h*px))

-    foreach(asset -> write(sock, JSON.json(import_cmd(asset))),
+    Reactive.foreach(asset -> write(sock, JSON.json(import_cmd(asset))),
          window.assets)

     main = loadfile(file)

A better solution might be to request that Reactive make its version of foreach compatible with this addition to the language (JuliaLang/julia#13774). I'm not particularly familiar with Reactive and am not is a strong position to pose this as a Reactive issue. @shashi you seem somewhat plugged into Reactive development, what do you think?