Remove empty lines in changelog.
Add config to sign acts_as_indexed gem releases.
Revert "Add config to sign acts_as_indexed gem releases."

This reverts commit 91e992299d3162f61fb6e6a3a032aea6d473547e.
Add MRI 2.0.0 to tested Ruby versions.
Fix issue where underscores are not stripped by the pre-tokenizer. Fixes issue #45.
0.8.3 release