Update modification time of Eclipse resources when they change.

Eclipse, at least on Linux, does not update the modification time of 
folders when their children are modified. Since we'll be using
modification time for syncing, we need to update the modification time
of folders when new children are modified, added or deleted.
Updated local stamp modifier.
Update modification stamp of folders on Google Drive.
Remove unnecessary modifier.
Temporarily upload projects to Google Drive.

For testing purposes, the project selection dialog can now be use to 
upload files to Google Drive.
Handle possible Null pointer exceptions gracefully.
Get fileId only after execute method has completed.
Avoid using this property to stop Google's servers from whining.
Null checks in event attributes. Very important.
Remove unnecessary null check in method.
Remove debug statement.
Implement an object that updates files in Google Drive.