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ARROW-4912: [C++] add method for easy renaming of a Table's columns

This will allow users to produce a table with custom column names from a csv file without specifying a schema (and requiring type inference)

Author: Benjamin Kietzman <bengilgit@gmail.com>

Closes #4557 from bkietz/4912-Allow-specifying-column-names-to-CSV-rea and squashes the following commits:

213c19383 <Benjamin Kietzman> set correct schema in Table::RenameColumns, tests in C++ and py
1341a80e1 <Benjamin Kietzman> fix careless copypasta
a6eb3f0ae <Benjamin Kietzman> use gmock's improved assert syntax
9ab8de811 <Benjamin Kietzman> add autopep8 note to developers/python.rst
5fdbf1a80 <Benjamin Kietzman> autopep8, test f/incorrect number of args
81e5adc8e <Benjamin Kietzman> add cython bindings
e46752673 <Benjamin Kietzman> Table::RenameCols can fail if an incorrect number of columns are provided
be18cfc20 <Benjamin Kietzman> add method for easy renaming of a Table's columns