added ProgressDialog as classmembers so they can be better cleaned with .dismiss()
refactoring:
- made all asyncTasks (which where before inner classes) to an own class so they can be reused better
setup the callbacks for the onClick listener for the checkIn and checkOut in the activity because they to UI stuff. And it makes the onClick listener reusable in other activities
added functionality on title details page
- if no loanable available, user gets a message
added helper to check the internet connection
Merge branch 'master' into title-details_development

Conflicts:
	AndroidManifest.xml
	res/layout/navigation_drawer_list_view_item.xml
	res/values/strings.xml
added login "frame" in settings activity

added activity which should be shown if a internet connection is required but none available
Merge remote-tracking branch 'upstream/master' into title-details_development
made LoanListAdapter compileable
Merge pull request #6 from creydr/title-details_development

title-details_development
Merge pull request #36 from creydr/master

improved isbn scanner and title details activity