update b8 to version 0.6.1

Class b8_storage_mysql does not get updated during this commit,
because our implementation already uses PDO_MySQL instead of
the old mysql API used by the offical b8 codebase's class and
the fix for the potential SQL injection is already included in
our PDO version.
Merge pull request #100 from Thoronador/feature-language-en_US

add missing English (US) language texts
Merge pull request #99 from Thoronador/feature-b8-0.6.1-update

update b8 to version 0.6.1
fix psr-1

Signed-off-by: Sweil <mail@sweil.de>
Merge branch 'alix6-bugfixes' of github.com:Sweil/Frogsystem-2 into alix6-bugfixes