Integration test improvements (#453)

* End the app if an error occurs

* Fixing a proper reset of the tests folder

* Made tests cancelable through Ctrl+C

* Updated tap dependency

* Using shebang to make sure the correct executable is called.

* Proper tape tests need to be ended.

* Making use of resolveMatch for shorter, better readable tests

* Using waitForAndClick to get cleaner, quicker tests that don’t fail.

* Extracted wait into until

* The Default wait period is too long in those cases

* Using waitForExist for quicker results.

* Used shebang for tests/index

* Using tap for all tests.

* Using waitForMatch to quicker find out if a match exist and don’t fail the test if the text happens to show something different in-between (like the loading bytes)

* shebang error on windows

* Better error logs on windows tests

* Updated spectron

appveyor.yml

@@ -1,4 +1,6 @@
 environment:
+  ELECTRON_ENABLE_STACK_DUMPING: 'true'
+  DEBUG: '*,-nugget*,-eslint*,-extract-zip*,-sumchecker*,-electron-download*,-dependency-check*'
   matrix:
     - nodejs_version: "8"