[client] Modify navbar related CSS class names to migrate to bootstrap 3
[client][base] Remove obsolete "navbar-inner" div element
[client][base] Fix indent
[client][base] Add "navbar-btn" class to buttons in navbar to migrate to bootstrap 3

And remove a needless class "dropdown-toggle" for the status button.
[client][dashboard] Add "progress-" prefix to progressbar related classes to migrate to bootstrap 3
[client] Fix broken layout of some dialogs on bootstrap 3
[client][events] Shorten width of num-events-per-page entry
[client] Don't use setTimeout() for setting initial button state anymore.

It's used because "disabled" attribute is removed unexpectedly by
bootstrap 2. But the issue doesn't exist in bootstrap 3.
[client][README.md] Update the version of Bootstrap

2.3.2 ->
3.1.0

Now we've completed to migrate to Bootstrap 3 (maybe).
[client] Fix a typo in CSS

top ->
bottom
[client] Tune margins of lables
[HatoholUserRoleEditor] Arrange layout
[client] Add files of Bootstrap 3.1.0

The license of Bootstrap was changed to MIT License which is
compatible with GPLv2, so we can distribute it with Hatohol.

github issue #125
[client][README] Update description about Bootstrap