diaspora* 0.2.0.1

• Bump rails to version 3.2.16, fixes several security issues, see http://weblog.rubyonrails.org/2013/12/3/Rails_3_2_16_and_4_0_2_have_been_released/
• Bump recommended Ruby version to 1.9.3-p484, see https://www.ruby-lang.org/en/news/2013/11/22/heap-overflow-in-floating-point-parsing-cve-2013-4164/