Update to elasticsearch 1.3

Closes #35.
Fix integration tests

Due to change in test infra, we disable by default automatic loading for classpath plugins (see https://github.com/elasticsearch/elasticsearch/commit/75efa47d5ad89da8d51bbdf82e0e4c3c67108139), we need to explicitly enable it again.
Add integration tests

Closes #36.

(cherry picked from commit f2c83df)
Update to Lucene 4.9.0

Closes #37.

(cherry picked from commit 5243bdc)
Update to elasticsearch 1.4.0

Closes #38.

(cherry picked from commit 7ee03e7)