Added DiscriminantEqualZero
Added DiscriminantLessThanZero
The keyboard is set to numeric with
android:inputType="phone"
in XML
Added LinearEquation
The solution TextView is now close to the solution button
Added hint tip in EditView in XML:
android:hint="@string/solveHint"/>
Got rid of the global variables
Added try/catch to catch split string exceptions
Changed public String solveEquation(View view) to public void solveEquation(View view)
Merge pull request #1 from JohnnyPP/testing

Merging last changes to master