Ability to push a record to several indexes.
Merge branch 'master' into multiple_indexes

Conflicts:
	lib/algoliasearch-rails.rb
	spec/integration_spec.rb
Add missing highlightPreTag/highlightPostTag settings
Bump to 1.9.5
Fixed per_environment option not working on additional indexes
Ability to define slaves from algoliasearch block
Merge branch 'multiple_indexes'
Fixed 1.8 syntax compatibility
Ability to call ```index!``` and ```remove_from_index!``` and wait until it's indexed
Fixed unit tests: wait until indexing terminated
Missing default parameter value
Ensure additional slave/index/attributes are not configured on slaves
Bump to 1.10.0
Use :if and :unless constraints to detect if a record has changed as well.
Bump to 1.10.1
Not fatal
Cosmetics, improved UT
Expose the synonyms/placeholders features
Upgrade to algoliasearch-client-js 2.5.0 (fallback on JSONP if CORS is not available)
Bump to 1.10.2