LB-485: User Comments embed

changed reCAPTCHA public key for devel.sd-test.sourcefabric.org.
LB-485: User Comments embed

added service-gateway-recaptcha
LB-726: Create a theme for big-screen

big-screen theme added.
Merge pull request #178 from nistormihai/devel

LB-726: Create a theme for big-screen
LB-683 : Create the user comment
LB-357 : Migration script from Live Blog 1.3 to Live Blog 1.6
LB-357 : Migration script from Live Blog 1.3 to Live Blog 1.6
Conflicts resolved