Fix a typo.

The plugin is installed in $ES_HOME/plugins/jdbc according to the
context.
Merge pull request #360 from jasonzzz/master

Fix a typo.
add * to 'chmod 644 /plugins/jdbc/' to set correct perms on jbdc/
Merge pull request #382 from alexcreek/chmod-in-readme

add * to 'chmod 644 /plugins/jdbc/' to set correct perms on jbdc/
Merge remote-tracking branch 'origin/master'
- moving time stamps from river source to river state for persistency
- reducing cron thread pool size from 4 to 1
Merge branch 'master' into 1.2
1.2.4.4