Use calculateWithMol, -Gram and -Particles in onClickCalculate
Make some fields and methods in CalculateFragment.java private
Create method validateElement in MainActivity.java
Add public static methods for common dialogs to CustomDialog.java
Directly alert if element is wrong when pressing return

Add some easter egg
Improve formatting
When clicking on list item, go back and fill elementEditText
Define parent activity of ElementInfoActivity.java
Fix exception when going back with no result