Moved functions from elasticsearch-rake-tasks to helpers module
added new rake task 'copy_index'
Can set server and index via rake parameters for task 'dump'
Fixed broken definition for curl_request in helpers.rb. Fixed broken call to curl_request in elasticsearch-rake-tasks
Renamed copy_index to reindex. Added parameters to task reindex.
Added missing includes for eson
move helpers file to the appropriate place

the helpers file should not live in the "lib/" directory to prevent
conflicts when loading code.
fix dump task

the line instatiating the reader was missing some parameters.
Merge pull request #1 from Asquera/index-transfer

Allow transfering one index to another on the same server