Perform local immediate refresh instead of background refresh

First off, thanks for writing and sharing this helpful little plugin.  I found the refresh mechanism to be too slow in my case, where I'm modifying files with an external editor and I want Eclipse to re-build the project as soon as I save a file.  Using the `refreshLocal` method seems to reduce the refresh time from 5-10 seconds to 1-2 seconds.  You don't have to merge this PR, but I just wanted to post this code in case someone else is in the same situation.  Cheers :)