check if current type exists in Index
@see http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/indices-types-exists.html#indices-types-exists
check if current type exists in Index - changes.txt
check if current type exists in Index - phpunit test
Merge remote branch 'upstream/master'

Conflicts:
	changes.txt
Elastica_Type::exists()  - added index->refresh() after document add in unit tests
Merge pull request #481 from krzaczek/master

check if current type exists in Index
Add '/' to escaped terms list

Refs #440