Fix .npmignore by adding the .git file (as opposed to just a directory, which is not the case for git worktrees) and the .failed-tests file.

Author: DanielRosenwasser

.npmignore

@@ -12,7 +12,11 @@ tests
 tslint.json
 Jakefile.js
 .editorconfig
+.failed-tests
+.git
+.git/
 .gitattributes
+.github/
 .gitmodules
 .settings/
 .travis.yml
@@ -23,6 +27,5 @@ Jakefile.js
 test.config
 package-lock.json
 yarn.lock
-.github/
 CONTRIBUTING.md
 TEST-results.xml