Improving the last changes

[jeroig]

• Pass Integration Test
• Delete alias of indexes when we delete the index
• Register always the last model
• Pass admin_index_test.rb (Please see Patch "take into consideration small time parts" author "frazerh")
• Support searching in multiple classes
• Test about new support
• Modified README to reflect changes
• BugFix search_count when use :term (Please see Patch "Bug: Making search_count work with Query DSL" author "pfeiffer")
• Tests makes setup and teardown
• Specify ignore files (.gitignore)
• Detail version gem rubberband
• Bump version 0.0.2