Merge pull request #262 from maciejlew/master

Groups welcome partial templates
Groups and cleans voipaccount templates
LMSCache
Removes error_log from LMSCache
Moves all VoIP account methods to LMSVoIPAccountManager class. Moves getUserName method to LMSUserManager class. Moves getCustomerName method to LMSCustomerManager class. Keeps backward compatibility. Adds documentation for moved methods.
Merge branch 'master' of https://github.com/lmsgit/lms