[Release] 1.7.0

[radazzouz]

[IMPROVED] Improved compatibility with Xcode 7.2. {#279}
[IMPROVED] Updated the README to mention that SFSafariViewController now works on devices running iOS 9.2 or later. {#239, #280}
[IMPROVED] Updated the Javascript code for Web View Filling. {#281}

[FIXED] Fixed warnings caused by missing icons for the demo apps. {#279}
[FIXED] Fixed an issue where ACME (Swift) was a Universal app, causing a crash at launch on iPad. {#279}