Fix full_url to correctly save as a url

[bxk334]

ecg/ecg/jgi.py

Line 122 in d014942

full_url = self.homepage_url+html_suffix

self.homepage_url is saved as a string "https://img.jgi.doe.gov/cgi-bin/m/main.cgi" with the quotation marks as default homepage url. This gives an error message. A temporary fix would be to replace with line below, though it hard codes the homepage url.

full_url = "https://img.jgi.doe.gov/cgi-bin/m/main.cgi{}".format(html_suffix)