Fixes #7230, #12021 - Upgrade to Rails 4.1.5

This commits upgrades Rails to Rails 4.1.5. See a description of the
changes included here, and go to the pull request in GitHub to see more
detailed explanations:

• Update gems to a Rails 4 compatible version, including dependencies...

Fixes #12748 - "Add Smart Variable" button does not change color on click

Fixes #6007 - Allowing to hide smart class parameters

Fixes #8799 - Show override button when removing overriden global param

Previously, when removing an override for an existing parameter the
override button was not displayed again until the page was reloaded.
Also saved call to `mark_params_override()` when overriding a single...

Fixes #11458 - Override inline for class parameters

This implements override inline for smart class parameters and smart
variables in host and hostgroup edit forms.
Global variable override inline will be done in a seperate PR.

Authors:
Ori Rabin <orrabin@redhat.com>...

Fixes #12424 - Labels in chart legends are aligned to left

Fixes #12418 - Correct dashboard behaviour for updated gridster

Updated version of gridster changed the widget class from gs_w to gs-w:
https://github.com/ducksboard/gridster.js/commit/c1668d9ab6261d3c5dc4215abdb73ca516492c19
This led to a bit of breakage in css and js which is fixed by this commit....

Fixes #12204 - Show interface form helptext in popovers

Refs #12204 - Resize interface modal, fields and labels

To cause virtual network settings to display correcty changes were also needed
in the layout of the compute attribute forms.

Fixes #12222 - prevent resizing textarea to under one line on FF

Fixes #12131 - long strings in reports are hard-wrapped