Fixed issue for WPF applications where calling Start method from timer causes it to crash when the download of update completes.

• Fixed issue where if the user cancels the download of an update and then try it again it stuck.
• Fixed #11 causing AutoUpdater.NET to not kill WPF application after update finishes downloading.
• Fixed issue in ZipExtractor that causes it to not wait for the application to close before extracting the update file.
• Fixed French text causing width problem for Remind Later button on update dialog.
• Added new option ReportErrors that when set to true allows AutoUpdater.NET to report errors. This closes #16.
• Added new option mandatory in the XML file that when set to true ignores Remind Later and Skip options and hide those buttons.
• Added option to hide Remind Later button.
• Made AppTitle property to Public as suggested by CitizenMrL. Now developers can change the application title shown in update dialog.
• Now developers can use a timer to check for updates frequently. This closes #13.

• Added ZipExtractor to auto extract zip file provided in an XML file between url tags.
• Now developer can hide Skip button by setting ShowSkipButton property to false.
• Added an optional parameter in Start method to provide assembly for version checking.

• Now AutoUpdater dialog title will be created internally to make it more localization friendly.
• Added application logic provided by Xavier Averbouch to kill other running instances of the current application when update finishes downloading.
• Now if the developer doesn't provide Release Notes URL then update dialog won't show webBrowser control and make the dialog smaller.
• Fixed bug in the GetFileName method as suggested by Koen van Hove. Now using GitHub or Amazon S3 URL for update file won't result in a WebExption.
• Added Turkish language translation.
• Added support for ChangeLog and Download URL relative to the location of an XML file.
• Fixed issue when using local network path as a Download URL raises an exception.
• Fixed 'Release Notes:' typo in UpdateForm.
• Replaced String.Format with Path.Combine to prevent errors related to temporary path.