Allow fred to name the column but default to "VALUE"

[milktrader]

FRED data gives an uninformative column name (ie, VALUE) so the current fred implementation changes that to whatever the file name is. This should be an option.

fred(econdata::String) = fred(econdata::String, "VALUE")

[milktrader]

Here is a use case:

foo  = fred("CUSR0000SEHF01");

head(foo, 2)

6x2 DataFrame:
              Date CUSR0000SEHF01
[1,]    1952-01-01           27.5
[2,]    1952-02-01           27.5
[3,]    1952-03-01           27.5
[4,]    1952-04-01           27.5
[5,]    1952-05-01           27.5
[6,]    1952-06-01           27.5

I would rather have "VALUE" in this case, and have the option to name the column with CPI.

[milktrader]

Fixed 070d635a26f9297f989e49401670d730584dd1a2

[milktrader]

I want to figure out how to close from commit. This is a test.

[milktrader]

The problem I was having with closing this from commandline was because I'm using the following fancy script, which doesn't work with closing issues, not sure why.

function gg(){
    git commit -v -a -m "$*"
}