Encode any values for CSV

[dtaniwaki]

Hi,

Thank you for merging the PR about CSV encoding. I found a bug in an edge case after it was merged.

If a model has columns with serialized object, they don't respond to "encode!" but can include strings to encode.

e.g.
{a: "a", b: "あいうえお"}

["a", "あいうえお"]

So my solution here is encode any values after convert it to string since the values are converted sooner or later in CSV lib.
Could you consider to merge this fix?

[dtaniwaki]

@seanlinsley
Do you know why ./script/travis_cache download_bundle failed in travis CI?
I haven't touched anything about this.

[seanlinsley]

No, I don't know why it's a problem on this branch...

[seanlinsley]

The test suite should start working again if you rebase on master.

[dtaniwaki]

@seanlinsley
It still fails. The error was S3 credential missing. Do I need do something about the credential on my side?

[seanlinsley]

Sorry, that was my fault. It should be fixed now.

[dtaniwaki]

It succeeded now. Thank you!

[dtaniwaki]

could you merge this fix??

[seanlinsley]

This couldn't be merged, because the CSV code has been changed around a lot lately. However, 3fb4c51 on master should resolve this.