Login page updated to get OAuth2 access token
Adding support to OAuth2 'authorization code' grant type [WIP]
Merge master into oauth_login
Added support to OAuth2 'authorization code' grat type: get & save access token, use it to access ownCloud
Fixed double upload of files with OAuth + Bearer authorization
Redirect app to login screen when operations in file details view fail due to bad credentials
Merge branch 'master' into oauth_login

Conflicts:
	AndroidManifest.xml
	res/values-de-rDE/strings.xml
	res/values-de/strings.xml
	res/values/strings.xml
	src/com/owncloud/android/Uploader.java
	src/com/owncloud/android/datamodel/FileDataStorageManager.java
	src/com/owncloud/android/files/OwnCloudFileObserver.java
	src/com/owncloud/android/files/services/FileDownloader.java
	src/com/owncloud/android/files/services/FileUploader.java
	src/com/owncloud/android/operations/RemoteOperationResult.java
	src/com/owncloud/android/syncadapter/FileSyncAdapter.java
	src/com/owncloud/android/ui/activity/AuthenticatorActivity.java
	src/com/owncloud/android/ui/activity/FileDisplayActivity.java
	src/com/owncloud/android/ui/activity/UploadFilesActivity.java
	src/com/owncloud/android/ui/fragment/FileDetailFragment.java
	src/com/owncloud/android/ui/fragment/OCFileListFragment.java
Redirect app to login screen when any operation started from a foreground component fails due to bad credentials
Cleaning-up AuthenticatorActivty code
Cleaning-up AuthenticatorActivty code
Merge remote-tracking branch 'origin/oauth_login' into oauth_login
Fixed visibility of authorization details when the device is turned aside; removed unused classes from old OAuth flow
Locked edition of URL and password in redirection due to expired credentials; error messages reviewed; fixed capture of redirection from web browser in OAuth
Fixed behaviour when authorization is denied by user; added toast message to explain the need to update credentials
Save new token / credentials to make them permanent
Fixed NullPointerException in log
moved About App into preferences 
https://github.com/owncloud/android/issues/57
This wraps the android.util.logging into Log_OC which , if its enabled
in the app, logs the logcat into a file. It also includes the phone
information (MODEL, VERSION...)

https://github.com/owncloud/android/issues/97
Log_OC included
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