`Earth.init` is deprecated, use `require earth/:domain` instead.
Fixed syntax errors of sql
When the converter is set to alchemist, the value of weight is an
instance of Alchemist::NumericConversion. So we should convert it to a
float with the :sprintf.
Upgraded activerecord and activesupport to 3.2.12, and lock roo to version 1.10.1
Use the new api of minitest-reporters
Make `data_miner` available for all rails 3 app.
it can work well on MySQL where ANSI_QUOTES is on
Convert to a float by default, this will fix #23.
Added assertions
Conversion will return a float by default.
Merge pull request #22 from towerhe/master

Fixed tests