Improve file more, Part 1

- Use Uris where it makes sense, Use File class to clarify it's a file (and not whatever else a string could be)
- Show sdcard in side menu in storage API #665
- Propose filename with gpg ending when storing it using the storage API #665
- Don't show output dialog on Android 4.4 #665
- Only show filename on Android < 4.4 #665

TODO:
- File deletion for Android < 4.4
- Testing (especially with Android < 4.4)
- Batch-encryption
- UI
- Temporary content provider (see #665 discussion)
Merge branch 'master' of github.com:mar-v-in/open-keychain into improve-file-more
Merge branch 'master' into improve-file-more
Merge branch 'master' into improve-file-more

Conflicts:
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/KeychainApplication.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFileFragment.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFileFragment.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/FileDialogFragment.java
Missing import after merge
Add temporary file storage as discussed in #665

Writable from OpenKeychain, readable worldwide. Should be used to write shared files to it by first creating the file using TemporaryStorageProvider.createFile and then write to the Uri returned.
Encrypt/Decrypt UI work
Add support for multiple input/output URIs to KeychainIntentService
Many changes to file ... and still incomplete

- Multi file
- Reworked UI
Merge branch 'master' into improve-file-more

Conflicts:
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/KeychainIntentService.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptActivity.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptActivity.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/KeyListFragment.java
	OpenKeychain/src/main/res/layout/encrypt_content.xml
Add TokenAutoComplete to gradle
Load of rework on EncryptActivity, still some TODOs
Make DecryptFragment abstract, as it should be
- add multi select for storage api (kitkat)
- UI fixes
- refactoring
Merge branch 'master' into improve-file-more

Conflicts:
	.gitmodules
	OpenKeychain/build.gradle
	OpenKeychain/src/main/AndroidManifest.xml
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/CachedPublicKeyRing.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFileFragment.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptMessageFragment.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptAsymmetricFragment.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptFileFragment.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptMessageFragment.java
Fix merge
Fix string resources
Merge branch 'master' into improve-file-more

Conflicts:
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/provider/CachedPublicKeyRing.java
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/EncryptAsymmetricFragment.java
Fixes after merge
Merge branch 'master' into improve-file-more