fix #225, merged #228, updated ios options naming, updated default value for databaseEnabled android option, added new methods and events

updated DropDown workaround: load it as soon as possible and load also for iframes where possibile (same origin)

Added enableDropDownWorkaroud webview option for Android to enable a temporary workaround for html dropdowns (issue #182)

Fixes null error when calling getOptions for InAppBrowser class

updated shouldOverrideUrlLoading event for #146, added print method and event #128, fix #123 javascript handler for Android API <= 22, renamed onTargetBlank to onCreateWindow event, deleted useOnTargetBlank option, added supportMultipleWindows android option, added getDefaultUserAgent static method, Updated default value for domStorageEnabled option to true

updated shouldOverrideUrlLoading event for #146, added print method and event #128, fix #123 javascript handler for Android API <= 22, renamed onTargetBlank to onCreateWindow event, deleted useOnTargetBlank option, added supportMultipleWindows android option, added getDefaultUserAgent static method, Updated default value for domStorageEnabled option to true

updated shouldOverrideUrlLoading event for #146, added print method and event #128, fix #123 javascript handler for Android API <= 22, renamed onTargetBlank to onCreateWindow event, deleted useOnTargetBlank option, added supportMultipleWindows android option, added getDefaultUserAgent static method, Updated default value for domStorageEnabled option to true

updated README.md and issue templates, added WebStorage.getInstance().deleteAllData() to clearAllCache on Android

Added pause and resume methods for Android, Added pauseTimers and resumeTimers methods, Added new historyUrl optional parameter only for Android, fix #202, should fix #201

Fixed error 'java.lang.ClassCastException:  cannot be cast to android.view.WindowManagerImpl' on Android when using native alert dialogs, updated README.md with Xcode version required