Fix app crash handling, provide more debug output when it fails

Summary:
- The check for the crash log file was missing a forward slash at the end of the path (e.g. `ls /storage/emulated` instead of `ls storage/emulated/`)
- Add the output of `adb shell ps` in case the app crash handling fails to provide more debugging information (make it clear whether the process is still alive or not)
- Fix some random typos and extra whitespace

Test Plan:
- `mvn clean install`
- Ran one of the Facebook end-to-end tests.

Reviewers: ainsej, kumar.rangarajan, juyuan.yang.9, asm

Reviewed By: asm

Differential Revision: https://reviews.facebook.net/D28677
Merge pull request #697 from frolix/master

Selendroid-standalone argument -emulatorOptions to handle multiple options for emulator
Don't use System.out.println() and Throwable.printStackTrace()

Summary: Printing to stdout is a really bad practice. Use logging which can be configured by the users of Selendroid as needed, e.g. hidden from the console and redirected to a file.

Test Plan:
  $ mvn clean install
  ...
  [INFO] ------------------------------------------------------------------------
  [INFO] Reactor Summary:
  [INFO]
  [INFO] selendroid ........................................ SUCCESS [0.137s]
  [INFO] android-driver-app ................................ SUCCESS [2.024s]
  [INFO] selendroid-server-common .......................... SUCCESS [1.013s]
  [INFO] selendroid-server ................................. SUCCESS [17.088s]
  [INFO] selendroid-grid-plugin ............................ SUCCESS [0.676s]
  [INFO] selendroid-common ................................. SUCCESS [0.914s]
  [INFO] selendroid-standalone ............................. SUCCESS [17.732s]
  [INFO] selendroid-client ................................. SUCCESS [0.633s]
  [INFO] selendroid-test-app ............................... SUCCESS [4.871s]
  [INFO] ------------------------------------------------------------------------
  [INFO] BUILD SUCCESS
  [INFO] ------------------------------------------------------------------------

Reviewers: ainsej, kumar.rangarajan, juyuan.yang.9, asm

Reviewed By: asm

Differential Revision: https://reviews.facebook.net/D28887
Merge remote-tracking branch 'upstream/master'