Fixed repeated request for create first account when all the accounts where removed after the app was left in an actitivy not root in its task
PreviewImageActivity protected against access to non-existing account
PreviewVideoActivity protected against access to non-exiting account
Fixed bad transitions after adding protection for removed accounts to PreviewVideoActivity
Merge remote-tracking branch 'origin/develop' into check_account_existance_in_gallery
UploadFileActivity protected agains access to non-existing account
ConflictsResolveActivity protected against access to non-existing account
Added new contextual option in account list to allow the user modify the password
AuthenticatorActivity is started when 'change password' is selected for a list in the list of accounts
Removed toast message for updating credentials when user manually accessed to the AcountAuthenticatorActivity
Fixed focus in AuthenticarActivity for changing password so that server URL is not editable
Make the 'refresh' button enabled when visible, although the URL-input field is disabled, when the password is being updated
Updated some messages in login activity
OC-458: new branding.xml. OC-394
OC-459:new string server_url, new bool show_server_url_input. OC-394
OC-460:URL-input GONE. OC-394
Merge pull request #195 from owncloud/fixed_crash_due_to_uploads_to_accounts_not_already_existing

Fixed crash due to uploads to accounts not already existing
Merge branch 'release-1.4.1' into develop
Merge branch 'master' into develop
OC-461: Add check server button. OC-394