Add "GDP per capita (current US$)" Indicator from World Bank

Source:
http://data.worldbank.org/indicator/NY.GDP.PCAP.CD

Download Source:
http://api.worldbank.org/v2/en/indicator/ny.gdp.pcap.cd?downloadformat=csv
Remove 2 lines of extra header, for consistency

The header indicates the source of the information,
which is already indicated in meta.txt. It pushes
the column headers for the actual to third row,
while it is expected in first row by our import scripts.
Add "Scientific and technical journal articles" Indicator

Source:
http://data.worldbank.org/indicator/IP.JRN.ARTC.SC

Download Source:
http://api.worldbank.org/v2/en/indicator/ip.jrn.artc.sc?downloadformat=csv
Remove 2 lines of extra header from data.csv
Add "CO2 emissions (kt)" Indicator from World Bank

Source:
http://data.worldbank.org/indicator/EN.ATM.CO2E.KT/countries

Download Source:
http://api.worldbank.org/v2/en/indicator/en.atm.co2e.kt?downloadformat=csv
Remove 2 extra lines of header from data.csv