Remove obsolete Ohloh functions and tests

Hi!

I removed PopulateProjectIconFromOhloh and PopulateProjectLanguageFromOhloh as well as their corresponding tests as discussed in <https://github.com/openhatch/oh-mainline/issues/1462>.

I ran the whole test suite before and after making these changes, and all of the tests passed on my system.

Thanks to @willingc for her guidance and encouragement! : - )

Thanks & regards,
Eeshan Garg