Add small fixes for bootstrap 3. Add tests.

[schneikai]

Hi,

I use this gem in a current Rails 4 project so I added some fixes to make it work better with Bootstrap 3. I also added tests for everything.

Details:
I removed the example code for inline. Correct me if I'm wrong but this wasn't TWBS 3 markup. Inline form elements in horizontal forms are also not mentioned in the Bootstrap docs so maybe we should remove this? If it should stay, I think the right markup would be to add a row container and add a column class to every form-group inside that row.

Also the date_select won't render 3 fields on one line without extra markup in TWBS 3 so the old screenshot is wrong. We would need to add extra css to make the 3 select inputs float or wrap them with a row and add column classes like for inline inputs.

Updated the height sizing classes to use input-sm instead of small.

Added the select element styling fix from #78

Updated the screenshot.

[stouset]

Please use a project-specific .gitignore. Most of the entries in this seem to be specific to your development environment, and should be in ~/.gitignore.

[stouset]

The example screenshot no longer has inline form fields, as it does in the original example image.

[stouset]

Why the double-nesting of the namespace?

[stouset]

Outside of the comments, it looks good. Thanks.

[schneikai]

About the inline form fields:
I removed the example code for inline. Correct me if I'm wrong but this wasn't TWBS 3 markup. Inline form elements in horizontal forms are also not mentioned in the Bootstrap docs so maybe we should remove this? If it should stay, I think the right markup would be to add a row container and add a column class to every form-group inside that row.

I could add it like this if you want to.

[stouset]

If we can keep some way to have inline form fields, it would be great. Use your best judgment, though — if TB doesn't support anything like it now, and it looks like any approach would be likely to break in future updates, we should probably abandon it.