Adding colors to column values messes up the spacing

```
What steps will reproduce the problem?

#!/usr/bin/python
from prettytable import PrettyTable

x = PrettyTable(["City name", "Area", "Population", "Annual Rainfall"])
x.align["City name"] = "l" # Left align city names
x.padding_width = 1 # One space between column edges and contents (default)
x.add_row(["Adelaide",1295, 1158259, 600.5])
x.add_row(["Brisbane",5905, 1857594, "\033[94m1146.4\033[0m"])
x.add_row(["Darwin", 112, 120900, 1714.7])
x.add_row(["Hobart", 1357, 205556, 619.5])
x.add_row(["Sydney", 2058, 4336374, 1214.8])
x.add_row(["Melbourne", 1566, 3806092, 646.9])
x.add_row(["Perth", 5386, 1554769, 869.4])
print x

What is the expected output? What do you see instead?

I would expect similar spacing and formatting with colors.

What version of the product are you using? On what operating system?

latest

```

Original issue reported on code.google.com by `obaidmus...@gmail.com` on 3 Jun 2014 at 2:01

Reproduce the issue with the supplied PrettyTable script and its print x entry point. Trace how colored cell values are measured when column widths and padding are calculated. Done means ANSI-colored values retain the same visible spacing and alignment as uncolored values.

Written by the indexing model from the issue text.