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
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'
Closes #1058
Fix gap between arrow in tooltip
Update version
Merge pull request #996 from motortalk/master

fixe nginx location rule for _mapping
Closes #1013
Fix link to schema docs
Doc updates
Merge remote-tracking branch 'upstream/master'
merge+build