fixe nginx location rule for _mapping

If you use a nginx proxy and elasticsearch with log4j you can see the following error message:

```
Error No index found at http://my.domain.local:80/logstash-2014.02.26/_mapping/field/*. Please create at least one index.If you're using a proxy ensure it is configured correctly.
```
Thats because the strict nginx location mapping rule.
Add tutorials, change clean to not remove entire docs dir
More docs
more docs
Removed undocumented panel.height, remove Math.floor from panel spans
Fixing IE Annotations

- Adding class for histogram-marker
- Adding immage for annotations
- Modifying jquery.flot.events to accept an image for an annotation
- Changing annotations to use histogram-marker
Removed undocumented panel.height, remove Math.floor from panel spans
Merge remote-tracking branch 'upstream/master'
More docs
Remove .DS_Store
Update docs to remove line comments
Merge remote-tracking branch 'upstream/master' into docs
Merge pull request #1066 from rashidkpc/master

Tutorials
Tweak for possibe race
Merge remote-tracking branch 'upstream/master'
Adding a way to hide the home button
Closes #1058
Fix gap between arrow in tooltip
Update version
Merge pull request #996 from motortalk/master

fixe nginx location rule for _mapping