Don't allow histogram bins contain dots
Remove port as required in exampleConfig

It's not required anymore as it has a default value
Update exampleProxyConfig.js

Fix port numbers.
Merge pull request #427 from hidekiy/fix-example

Update exampleProxyConfig.js
Merge pull request #423 from enriclluelles/patch-2

Remove port as required in exampleConfig
Merge pull request #418 from genuss/hist_dots

Don't allow histogram bins contain dots