0.0.16

• Fixed SWITCH formula returning N/A when the default value was "falsy" (like 0)

This release also brings a bunch of new supported formulas (Thanks Rodrigo Patrão)

• Support for SIGN function
• Support for SLOPE function
• Support for MAXIFS function
• Support for AVERAGEIFS
• Support for SUMIFS function
• Support for INT function
• Support for EDATE fuction
• Support for DATEDIF
• Support for NOW function
• Support for T, IMAGINARY and IMREAL