SCB 2014-12-01

Source: http://www.scb.se/Statistik/ME/ME0201/_dokument/ME0201_BS_2014_141127.pdf
Demoskop 2014-12-05

Source: http://www.demoskop.se/wp-content/uploads/2014/12/Väljarbarometer-Över-tid-1998-Dec-2014.pdf
Add missing `n` for Sentio polls
Add missing `n` for YouGov
Add missing `n` for Skop
Add missing `n` for Ipsos
Add missin `n` for demoskop
Merge pull request #22 from urdh/missing-n

Add missing `n` data
Merge pull request #25 from urdh/december-polls

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