Change email to example.com

[sdzhong]

Emails should use example.com.

android/app/src/main/java/com/example/vu/android/empowerplant/MainFragment.java

Line 344 in 1feb90a

.header("email", "someone@gmail.com")

android/app/src/main/java/com/example/vu/android/MyApplication.java

Line 166 in 1feb90a

String email = sb.toString() + "@gmail.com";