Fixed some javadoc
Merge from unstable23
We were not removing old indexes from soup_index_map table.
Modified test to make the issue apparent. Test now clear memory cache to simulate a an application being restarted (and also call resumeLongOperations).

Fixed AlterSoupLongOperation to do the proper cleanup.
Merge branch 'unstable23' of github.com:forcedotcom/SalesforceMobileSDK-Android into smartstore_reindex
Merge pull request #527 from wmathurin/smartstore_reindex

Issue with alter table