fixed user relation to wallet
added defaults

they are not in the migration because this way they could easily be modified without destroying the data
more explicit error adding
added more validations
removed unused gems
introduced redirection to home page if not signed in
added page_title
added begin … rescue

in case the record only has a receiver_addr
beautified; indendation: 4 spaces
removed wrong validation
improved exception and error handling
added support for network dependent addresses
added deletion of relative models on destroy
Merge branch 'development'