use the http response code instead of extists/found check.
Fix problem with _bulk delete.
Merge pull request #540 from nurikabe/master

Fix problem with _bulk delete.
add notes to changes.txt
Merge changes.txt conflict
Prepare release v0.90.10
Move contribution explanation up in Readme
Update to elasticsearch v1.0.0.RC1
Update README file
Simplify Readme. Move addtional documentation to Elastica.io
Update thrift plugin to 2.0.0.RC1