[NEW] Support multiple attachments

Fix crash when caching username and login failure when LDAP_Enable setting doesn't exist

Rollback version name to 1.1.0

Bump app version to 1.1.1

[BUG] Resolves incorrect context issue in login activity

[TYPO] Fixes typo in pinned messages fragment

[IMPROVEMENT] Adds error messages to login edit texts

[IMPROVEMENT] Adds animation in chrome custom tabs

[IMPROVEMENT] Adds error messages to sign up dialog edit texts

[BUG] Send GCM registration token to server at every connect

Independently of a new registration token being generated or not just send the current if available at every connect

Add request builder for a gcm registration request using the new REST api since 0.60 version of RC server