Merge pull request #85 from iwiznia/master

Add support for datetime filter
Add xboolean filter instead of eboolean
Version bump to 1.0.4
Regenerate gemspec for version 1.0.4
Fixes for tests in rails 3.0
Regenerate gemspec for version 1.0.4
Ability to pass label text explicitly and overwrite the one defined in grid
Fixed generator
Version bump to 1.0.5
Regenerate gemspec for version 1.0.5
data_row method
Merge branch 'master' into hiding_columns