Bump 'safe' gems (things that aren't Devise or OAuth)

Update Rails configuration to more resemble what would
be generated in a new app

UPDATED:
acts-as-taggable-on  3.4.4         3.5.0
autoprefixer-rails   6.3.1         6.3.6.2
bcrypt               3.1.10        3.1.11
bootstrap-sass       3.3.5         3.3.6
bourbon              3.2.4         4.2.7
clockwork            1.2.0         2.0.0
coffee-rails         4.0.1         4.1.1
compass              0.12.7        1.0.3
compass-rails        2.0.0         3.0.2
devise               3.5.6         3.5.10
domain_name          0.5.20160128  0.5.20160310
eventmachine         1.0.9.1       1.2.0.1
excon                0.45.4        0.49.0
execjs               2.6.0         2.7.0
foreman              0.75.0        0.82.0
guard-ctags-bundler  0.2.0         1.4.0
guard-livereload     1.4.0         2.5.2
haml-rails           0.5.3         0.9.0
heroku-api           0.4.0         0.4.2
heroku_san           4.3.2         4.4.0
jbuilder             2.2.16        2.5.0
jquery-rails         3.1.4         4.1.1
kramdown             1.9.0         1.11.1
multi_json           1.11.2        1.12.1
newrelic_rpm         3.14.2.312    3.15.2.317
nokogiri             1.6.3.1       1.6.7.2
raindrops            0.15.0        0.16.0
request_store        1.3.0         1.3.1
responders           2.1.2         2.2.0
sass                 3.2.19        3.4.22
sass-rails           4.0.5         5.0.4
spring               1.6.2         1.7.1
sprockets            2.12.4        3.6.0
sprockets-rails      2.3.3         3.0.4
tilt                 1.4.1         2.0.4
uglifier             2.7.2         3.0.0

ADDED:
compass-core         1.0.3
compass-import-once  1.0.5
concurrent-ruby      1.0.2
guard-compat         1.2.1
html2haml            2.0.0
mini_portile2        2.0.0
ruby_parser          3.8.2
sexp_processor       4.7.0

REMOVED:
dotenv               0.11.1
dotenv-deployment    0.0.2
fssm                 0.2.10
hike                 1.2.3
mini_portile         0.6.0

Gemfile

@@ -1,22 +1,22 @@
 source 'https://rubygems.org'
 ruby '2.3.1'
 
-gem 'acts-as-taggable-on', '~> 3.4.2'
+gem 'acts-as-taggable-on'
 gem 'airbrake', '~> 4.1.0'
-gem 'bourbon', '~> 3.2.3'
-gem 'choices', '~> 0.4.0'
+gem 'bourbon'
+gem 'choices'
 gem 'delayed_job_active_record', '~> 4.0.2'
 gem 'delayed_job_web', '~> 1.2.9'
-gem 'devise'
+gem 'devise', '~> 3.5.6'
 gem 'devise-encryptable'
 gem 'draper', '~> 1.4.0'
-gem 'sass-rails', '~> 4.0.4'
-gem 'compass-rails', '~> 2.0.0'
-gem 'bootstrap-sass', '~> 3.3.0'
+gem 'sass-rails'
+gem 'compass-rails'
+gem 'bootstrap-sass'
 gem 'pivotal-sass'
-gem 'haml-rails', '~> 0.5.3'
-gem 'jquery-rails', '~> 3.1.2'
-gem 'nokogiri', '~> 1.6.3.1'
+gem 'haml-rails'
+gem 'jquery-rails'
+gem 'nokogiri'
 
 gem 'oauth2', '0.8.1'
 gem 'omniauth', '1.1.4'
@@ -28,16 +28,16 @@ gem 'rails', '~> 4.2.6'
 gem 'rake'
 gem 'whenever', require: false
 gem 'rails-backbone'
-gem 'coffee-rails', '~> 4.0.0'
-gem 'eco', '~> 1.0.0'
-gem 'pg', '>= 0.17.1'
+gem 'coffee-rails'
+gem 'eco'
+gem 'pg'
 gem 'eventmachine'
 gem 'em-http-request'
 gem 'newrelic_rpm'
 gem 'unicorn', '~> 4.8.3'
-gem 'uglifier', '>= 1.3.0'
+gem 'uglifier'
 gem 'clockwork'
-gem 'jbuilder', '~> 2.2.4'
+gem 'jbuilder'
 gem 'ruby-openid', '~> 2.5.0'
 gem 'kramdown'
 
@@ -54,11 +54,11 @@ end
 group :development do
   gem 'heroku_san'
   gem 'guard-livereload', require: false
-  gem 'rb-fsevent', '~> 0.9.1'
+  gem 'rb-fsevent'
   gem 'spring'
   gem 'spring-commands-rspec'
   gem 'better_errors'
-  gem 'foreman', '~> 0.75.0'
+  gem 'foreman'
   gem 'guard-ctags-bundler'
   gem 'quiet_assets'
 end