Edited README

Added a line saying that the database specified in conf will not be
created automatically.
Added same README line to "for devs"
Merge pull request #154 from fredrikpersson/master

Updated version of Spring security and Spring core
Merge pull request #155 from fredrikpersson/readmedb

Edited README
Updated version number to 1.3.1
Merge pull request #156 from fredrikpersson/version131

Updated version number to 1.3.1
Updated version of Atmosphere framework
Merge pull request #157 from fredrikpersson/interruptedstreamfix

Updated version of Atmosphere framework