Merge pull request #4 from ifosch/string-calculator-mock

Añade mocking sobre la kata StringCalculator
Merge pull request #5 from ifosch/string-calculator-mock

Corrige README.md en StringCalculator con mock
Merge pull request #6 from ifosch/string-calculator-mock

Corrige README.md en StringCalculator con mock
Merge pull request #8 from ifosch/string-calculator-mock

Añade la documentación sobnre mock
Update README.md
Merge pull request #9 from ifosch/string-calculator-mock

Añade  los requirements para mock y ipython
Merge pull request #7 from ifosch/string-calculator-mock

Añade tests para StringCalculator
Añade test
Añade la kata del TPV y el almacen
Merge pull request #11 from ifosch/master

Añade la kata del TPV y el almacen
fixed bug for >1 digit operands, added test
Merge remote-tracking branch 'alvaroabascar/master' into string-calculator-mock
Arregla el import del StringCalculator_test.py