added support for == to Index
added support for == to Index

cilier/breeze,nikdon/breeze,calippo/breeze,ktakagaki/breeze,wstcpyt/breeze,mredaelli/breeze,crealytics/breeze,ktakagaki/breeze,chen0031/breeze,sheide/breeze,tjhunter/scalanlp-core,claydonkey/breeze,scalanlp/breeze,ContentSquare/breeze,eponvert/breeze,tjhunter/scalanlp-core