Use String#encode instead of Iconv

Modify to use String#encode instead of Iconv when ASCII Encodings.
There are two reasons:

1. @iconv was defined only encoding_to is NON_ASCII_ENCODINGS
2. Iconv is replaced from ruby-2.0

But when NON_ASCII_ENCODINGS, String#encoding cannot convert then
use Iconv as in the past.
use &times; instead of hardcoded unicode times
Merge pull request #2084 from n3bulous/bug/replace-utf8-x-with-times-entity

use &times; instead of hardcoded unicode times
Fixed number translation in filter
Merge pull request #2093 from Neschur/fix_number_translation_in_filterbox

Fixed number translation in filter
Merge remote-tracking branch 'upstream/pr/2075'
Use String#encode instead of iconv
Fix jruby build
Loose jquery-rails dependency. Closes #2086
Replaced bootstrap 2 to bootstrap 3
Fixes rails admin css
Removed red, blue and black from rails admin css
Try to fix navbar
Try to fix sidebar
Fixed breadcrums and navigation from left
Fixed fields render for form tag
Fixed dshboard and left navigation padding
Added count to each model as badge
Fixed view of paginator
Fixed css class for filter field