Add info on virtualenv, install from source close #1229
Add info on virtualenv, install from source
close #1229

saupchurch/server,ga4gh/server,david4096/ga4gh-server,david4096/ga4gh-server,saupchurch/server,saupchurch/server,ga4gh/server,dcolligan/server,david4096/ga4gh-server,dcolligan/server,dcolligan/server,ga4gh/server