Merge pull request #1 from Nodeclipse/master

Merging from upstream
Issue #31 : Need a descriptive error message if node settings are not correctly configured. User will now be prompted to open the preferences page.
Merge branch 'master' of https://github.com/pushkar85/nodeclipse-1
Merge https://github.com/pushkar85/nodeclipse-1 into pull-request-master
changed error message