Added debug tools menu, improved environment generation, updated readme (fixes #392)

As the description says:
- I've added some debug options in the ``` Go Tools ``` menu so that we can point users to give us meaningful details
- I've fixed some issues with env variables missing on some environments
- ``` PATH ``` now has auto-prepended the ``` GOROOT ``` and ``` GOPATH ``` ``` bin ``` folders from each paths (this should fix #392)
- I've updated the readme for this version to contain some extra pointers