Enable full column and row reference

[shirisha95]

VLOOKUP doesn't work
Vlookup from one sheet to another throws 'negative dimensions are not allowed'

Steps to reproduce the behavior:

1. Sample file
   Book1.xlsx
2. Sample Code:
   sample.txt
3. Error - Stack trace
   Failed DISPATCHING '='[BOOK.XLSX]SHEET2'!A:B' due to:
   ValueError('negative dimensions are not allowed',)
   Traceback (most recent call last):
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/schedula/utils/sol.py", line 748, in _set_function_node_output
   res = self._evaluate_function(args, node_id, node_attr, attr)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/schedula/utils/sol.py", line 533, in _evaluate_function
   res = func(*args)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/formulas/cell.py", line 166, in call
   return _assemble_values(base, values, sh.EMPTY)
   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/formulas/ranges.py", line 103, in _assemble_values
   res = np.empty(_shape(**base), object)
   ValueError: negative dimensions are not allowed

Expected behavior
VLOOKUP is to be evaluated

[vinci1it2000]

As I mention in the email the problem is not the VLOOKUP but just the range definition. Ranges like A:B or 1:6 (i.e. full column or row reference) are not fully supported in this version.

If you are on rush I suggest to modify the excel file specifying the range as A1:B4. Otherwise, I'm working to solve it.