Revert "Remove unused "data-provide" gem"

This reverts commit aae9674d45.

Gemfile

@@ -54,6 +54,7 @@ gem 'coderay',          '1.1.0'   # xml console visualize
 gem 'html5_validators', '1.2.2'   # model requements now automatically on html form
 gem 'nprogress-rails',  '0.1.6.7' # visual loader
 gem 'select2-rails',    '3.5.9.3' # for autocomplete
+gem 'bootstrap-datepicker-rails', '1.3.1.1' # datepicker
 gem 'liquid',           '3.0.6'   # for email templates
 
 # rights

Gemfile.lock

@@ -118,6 +118,8 @@ GEM
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
     bcrypt (3.1.11)
+    bootstrap-datepicker-rails (1.3.1.1)
+      railties (>= 3.0)
     bootstrap-sass (3.3.5.1)
       autoprefixer-rails (>= 5.0.0.1)
       sass (>= 3.3.0)
@@ -500,6 +502,7 @@ DEPENDENCIES
   activerecord-import (= 0.7.0)
   airbrake
   autodoc
+  bootstrap-datepicker-rails (= 1.3.1.1)
   bootstrap-sass (= 3.3.5.1)
   brakeman (= 3.6.1)
   bullet (= 4.14.7)

app/assets/stylesheets/admin-manifest.sass

@@ -9,5 +9,6 @@
 @import typeaheadjs
 @import selectize
 @import selectize.bootstrap3
+// @import bootstrap-datepicker3
 @import admin/admin
 @import admin/bootstrap-dialog-fix