Removed unused strings.
Do not set BasicCredentialsProvider if credentials aren't set in the blog. Add an interceptor to sent the credentials preemptively.
Updated translations:

 * New translations: Hindi, Simplified Chinese and Korean
 * Updated German, Spanish, French and Swedish strings.
Merge branch 'develop' into issue/1053-update-translations
Removing some empty translations from the German strings.
Set http password EditText to the 'textPassword' inputType.
Merge pull request #1102 from wordpress-mobile/issue/1101-XML-RPC-Basic-Auth-improvements

 XML-RPC Client - HTTP Basic Auth preemptive authentication
Merge pull request #1104 from wordpress-mobile/issue/1053-update-translations

Update Translations
Merge branch 'develop' into issue/1103-stop-progress-bar-onblogchange