Bump cartodb-common

Gemfile

@@ -53,7 +53,7 @@ group :assets do
   gem "compass",               "1.0.3"
 end
 
-gem 'cartodb-common', git: 'https://github.com/cartodb/cartodb-common.git', tag: 'v0.4.7'
+gem 'cartodb-common', git: 'https://github.com/cartodb/cartodb-common.git', tag: 'v0.4.8'
 gem 'roo',                     '1.13.2'
 gem 'state_machines-activerecord', '~> 0.5.0'
 gem 'typhoeus',                '1.3.1'

Gemfile.lock

@@ -8,8 +8,8 @@ GIT
 
 GIT
   remote: https://github.com/cartodb/cartodb-common.git
-  revision: 9b6eed36b18132693f360dc7f88a2f41371f7e13
-  tag: v0.4.7
+  revision: c49a25b587e55867a31d53a2cca1851821f7debd
+  tag: v0.4.8
   specs:
     cartodb-common (0.4.7)
       argon2 (~> 2)
@@ -462,7 +462,7 @@ GEM
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
-    sprockets-rails (3.2.1)
+    sprockets-rails (3.2.2)
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
@@ -488,7 +488,7 @@ GEM
     trollop (2.9.10)
     typhoeus (1.3.1)
       ethon (>= 0.9.0)
-    tzinfo (1.2.7)
+    tzinfo (1.2.8)
       thread_safe (~> 0.1)
     uber (0.1.0)
     unf (0.1.4)