If no credentials were stored and the user starts the app it will now redirect him to the search activity. Otherwise the user will be redirected to the "MyLoans" activity
added image for the ISBN scanner in case no scan data was received
changed error messages in ISBN scanner to support multi language support (put messages in strings.xml)
removed unnecessary code to start Isbn scanner
refactored the logintask as an external class
Merge pull request #47 from creydr/master

Small changes from our meeting today
added german language support
Merge pull request #48 from creydr/master

added german language support
added better error messages on adding a loanable
Merge pull request #50 from creydr/master

added better error messages on adding a loanable
Conflicts:
	res/values/strings.xml