Tighten up "arc land"

Summary:
Make sure on failure (restoreBranch()) we call `git submodule update --init --recursive` to handle all those purdy submodules. For the pushing step, wrap the push commands in the try / catch block so everything gets cleaned up nice if there's failure. BONUS - add --recursive to arc patch workflow to so nested submodules work correctly. (Crazy git users)

Fixes T3407, T2945.

Test Plan: I wasn't sure how to simulate a good "push" failure but I think this should work.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Maniphest Tasks: T2945, T3407

Differential Revision: https://secure.phabricator.com/D6885
Fix arc + svn + delted binary file with properties + image heuristic

Summary:
See IRC. This fixes an issue when deleting an SVN file that ends with one of the extensions in the regexp, which may only affect newer versions of SVN.

Possibly we shouldn't have this heuristic, or should move it elsewhere or make it more explicit, but at least stop it from being broken for now.

Test Plan: Ran `arc diff --only` in a working copy with a deleted binary file ending in ".jpg".

Reviewers: btrahan, nh

Reviewed By: nh

CC: aran, mbishopim3

Differential Revision: https://secure.phabricator.com/D6893
List all DOM extension classes as extension classes for static analysis purposes

Summary: See D6895. We currenty whitelist one of the DOM classes, but should whitelist them all. Classes not in this whitelist raise warnings when users who don't have the corresponding extensions installed lint code. We don't want to require you to install every extension just to send diffs, so we whitelist stuff that we know would exist if you did install everything.

Test Plan: bwahaha

Reviewers: btrahan, Firehed

Reviewed By: Firehed

CC: aran

Differential Revision: https://secure.phabricator.com/D6896
Merge branch 'master' of http://github.com/facebook/arcanist