Add new preference category on settings and list in it the accounts
Show all the active accounts on settings view and make behaviour of accounts checkbox similar to radio buttons
Change the title of preference for adding new accounts and remove unused commented code
Include 'add account' button after last account listed
Update the list of accounts in Preferences after adding a new account
Add long-press interaction to accounts elements for showing a context menu
Set first account checked as default when the current used account is removed and added some comments into the code
Remove classes not used more after changing the view of OC accounts
Merge branch 'develop' into accounts_view

Conflicts:
	res/values/strings.xml
Merge pull request #584 from owncloud/accounts_view

Accounts view