Fixing build issues

Xcode 10 caused small issues with building. This release is fixing it.

Default UI Styling

In this release we added default styling for action items. With this default configuration ImagePicker can be used as is, without any further styling and UI configuration.

fixed issues:

• #26 Deselcted cells after taking a picture

Support for iPhone X

• #17 both portrait and landscape mode adopts safe area insets when laying out collection view
• fixed small issues when pre-computing asset thumbnail sizes

Further UI improvements

• #12 recording video camera item contains duration indicator with red dot to better indicate that video is being recorded
• #13 used transparently carved text into a rounded rectangle to indicate that live photo has been taken
• #14 width of action and camera cells are adopting to certain ratio based on interface orientation
• #15 live photos and videos are always saved to Photo Library

Default configuration has it's own UI

Previous versions of Image picker had action items turned off by default, and camera and asset item cells provided by framework had no features nor UI. In this release all was updated so Image Picker provides basic functionality and UI as-is, without any need for further configuration.

• fixed few minor bugs #11, #7
• #9 action item cells are now both enabled by default providing default UI
• #8 default camera cell provides support for basic features and UI, such as taking photos, live photos, videos, flipping camera
• #10 default asset cell provides UI that distinguish photos, live photos and videos by providing an icon, contrasting gradient and video duration

Minor bug fixes + small API updates

• #1 camera collection view cell methods have @objc so they can be used with selectors
• #2 updated completion block to flipCamera method of camera collection view cell
• #4 default items source is Camera Roll album, instead of Recently added
• #6 added convenience methods to programatically access, select and deselect asset items