Merge pull request #37 from nateware/master

strip off (precision,scale) when comparing sql base types to avoid erroneous "schema changes"
Bump to version 0.3.9
add rename_field and tests
Merge pull request #38 from homeserve-alliance/master

PR for Issue 35
Bump to version 0.4.0
update readme
Merge pull request #39 from homeserve-alliance/master

update readme
remove legacy field checks due to Rails 4 changes