added possibility to install all database gems
added possibility to install all database gems

…via DB=all bundle install, useful for development

geraspora/diaspora,despora/diaspora,Muhannes/diaspora,geraspora/diaspora,Amadren/diaspora,Amadren/diaspora,spixi/diaspora,jhass/diaspora,KentShikama/diaspora,diaspora/diaspora,diaspora/diaspora,Muhannes/diaspora,jhass/diaspora,SuperTux88/diaspora,despora/diaspora,jhass/diaspora,Muhannes/diaspora,Flaburgan/diaspora,spixi/diaspora,Flaburgan/diaspora,diaspora/diaspora,despora/diaspora,SuperTux88/diaspora,Amadren/diaspora,KentShikama/diaspora,SuperTux88/diaspora,jhass/diaspora,Flaburgan/diaspora,geraspora/diaspora,SuperTux88/diaspora,despora/diaspora,geraspora/diaspora,spixi/diaspora,KentShikama/diaspora,diaspora/diaspora,Amadren/diaspora,Muhannes/diaspora,KentShikama/diaspora,spixi/diaspora,Flaburgan/diaspora