Fixed jQuery selectors for tooltips and popovers in bootstrap.js and bootstrap.coffee.
Restricted activesupport gem version to 3.x if Ruby version is less than 1.9.3.
Merge pull request #611 from lukehorvat/master

Fixed tooltip/popover issues
Avoid duplicate loading of JavaScript in Rails4

Layout template that is generated by the following command

```
rails g bootstrap:layout [LAYOUT_NAME] [*fixed or fluid]
```

includes `javascript_include_tag` in the body tag.

In rails4, turbolinks replace body contents instead of reload page,
so JavaScript loaded multiple times.

If target page has submit button with `data-confirm="Are You Sure?"`,
confirm dialog shown multiple times.
Merge pull request #616 from shizm/modify-layout-template-for-turbolinks

Avoid duplicate loading of JavaScript in Rails4
Merge commit '538f480a218b46181539ef5c35ac82dc3e44256d'