Utipy

- Adds array.window

- minor bugfix

- pandas.drop gets arguments *include* and *exclude*. This removes *cols* argument.
- pandas.makes_up get better compatibility with object dtypes. In certain circumstances when a Series is
an object, it will convert all elements to str, in order to find infs, NaNs and the special 'any' value
- Adds more tests

- pytest testing
- Adds import bug

- Adds array.windowed_reverse
- Adds documentation for lots of functions