Fix minor bugs in logs and ignore Eclipse files
Return empty response on error to avoid another error parsing the
response, e.g. in NodeRestartCallable.java
Fix deadlock executing commands. Output and error streams must be readed before the waitFor()
Check properly if the node or the hub are running
Update gson from 2.2.2 to 2.3 to make GridExtras compatible with version 2.44.0 of selenium-server