V0.57 update

[bendman]

This is largely thanks to work by @vexus2, but I updated the Table of Contents filename extraction to ignore everything before the final slash since some URLs now are absolute and contain subdirectories.

Example of different href attributes handled now:

<li class="navListItem"><a class="navItem" href="inputaccessoryview.html">InputAccessoryView</a></li>
<li class="navListItem"><a class="navItem" href="http://facebook.github.io/react-native/docs/keyboardavoidingview">KeyboardAvoidingView</a></li>

Previously this would return docs as the filename for the second link because it would assume there was a file extension. This new format doesn't assume the filename extension, but removes it if it exists.

[zhigang1992]

@bendman thank you so much for the awesome works.

I noticed that Properties tab on the left is not working?

Was it always like that?

It was already like that before this update.