Associate *.json files with JS Editor

[tomotaro1065]

Associate *.json files with JS Editor (NodeEditor based on JSDT JavaScript Editor).

This feature will be available next version 0.4 .

[paulvi]

This feature will be available next version 0.4 .
@tomotaro1065 hint: just select Milestone

[tomotaro1065]

Version 0.4 has been released.