Webview example (#606)

* Added a WebView example with a table view,
* Added README.md (adapted from RN webview_example).
* Comments and some refactoring.
* Use a font that actually exists.
* Use initSession callback with BUO, BranchLinkProperties. Added initializer PlanetData(branchUniversalObject: BranchUniversalObject).
* Added comments in Podfile.
* Added App Icon and Launch Screen.
* Registered view event in viewDidAppear: as recommended in docs.

Author: jdee

Examples/WebViewExample/.gitignore

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+!Podfile.lock

Examples/WebViewExample/Podfile

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+use_frameworks!
+
+# ----- Branch pod
+#
+# Take the Branch pod from this repo rather than CocoaPods.
+# Don't use the path: argument if you want the production
+# release from CocoaPods., e.g.:
+#
+# pod "Branch"
+
+pod "Branch", path: "../.."
+
+# ----- Other app dependencies
+
+pod "Cartography"
+pod "MBProgressHUD"
+pod "TextAttributes"
+
+# ----- Application target
+
+target "WebViewExample"

Examples/WebViewExample/Podfile.lock

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+PODS:
+  - Branch (0.14.5):
+    - Branch/Core (= 0.14.5)
+    - Branch/without-IDFA (= 0.14.5)
+  - Branch/Core (0.14.5)
+  - Branch/without-IDFA (0.14.5)
+  - Cartography (1.1.0)
+  - MBProgressHUD (1.0.0)
+  - TextAttributes (1.0)
+
+DEPENDENCIES:
+  - Branch (from `../..`)
+  - Cartography
+  - MBProgressHUD
+  - TextAttributes
+
+EXTERNAL SOURCES:
+  Branch:
+    :path: "../.."
+
+SPEC CHECKSUMS:
+  Branch: 4b96dfb74b92d2b947a6395172ef37af0dba1e2b
+  Cartography: '0538ccb4044acbbda2266335fc58cb4228794d90'
+  MBProgressHUD: 4890f671c94e8a0f3cf959aa731e9de2f036d71a
+  TextAttributes: 45b2713a1d174c377d320b51129c304eac381638
+
+PODFILE CHECKSUM: a645defd0626cadd6dd3834330eb3482cf7b2c6c
+
+COCOAPODS: 1.2.0

Examples/WebViewExample/README.md

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+# webview_example
+
+This app presents a list of the planets in a UITableView. When each
+row is tapped, a custom ArticleView is displayed using the a UINavigationController.
+
+The ArticleView contains a WKWebView and displays the Wikipedia page for the
+selected planet. The ArticleViewController creates a Branch Universal Object in
+`viewDidLoad` and registers a view event. A large Share button at the
+bottom of the ArticleView calls `showShareSheet` on the BUO.
+
+In the app delegate, the `Branch.getInstance().initSession()` callback routes
+inbound links and pushes an ArticleViewController for the appropriate article when
+a link is opened.
+
+## Building
+
+Just run `pod install` to install all pod dependencies.