Fixes bug 813388 - Make weeks the default for date range unit.
Fixes bug 813388 - Make weeks the default for date range unit.

twobraids/socorro,Tayamarn/socorro,mozilla/socorro,mozilla/socorro,linearregression/socorro,Tayamarn/socorro,Serg09/socorro,yglazko/socorro,bsmedberg/socorro,spthaolt/socorro,luser/socorro,Tchanders/socorro,yglazko/socorro,luser/socorro,Tchanders/socorro,pcabido/socorro,pcabido/socorro,Serg09/socorro,yglazko/socorro,yglazko/socorro,AdrianGaudebert/socorro,adngdb/socorro,twobraids/socorro,twobraids/socorro,pcabido/socorro,Tayamarn/socorro,luser/socorro,lonnen/socorro,Tchanders/socorro,Serg09/socorro,Tchanders/socorro,AdrianGaudebert/socorro-crashstats,KaiRo-at/socorro,bsmedberg/socorro,bsmedberg/socorro,twobraids/socorro,cliqz/socorro,adngdb/socorro,Serg09/socorro,twobraids/socorro,cliqz/socorro,mozilla/socorro,spthaolt/socorro,linearregression/socorro,yglazko/socorro,cliqz/socorro,AdrianGaudebert/socorro,linearregression/socorro,m8ttyB/socorro,luser/socorro,lonnen/socorro,pcabido/socorro,yglazko/socorro,rhelmer/socorro,linearregression/socorro,Serg09/socorro,spthaolt/socorro,adngdb/socorro,lonnen/socorro,bsmedberg/socorro,luser/socorro,bsmedberg/socorro,rhelmer/socorro,mozilla/socorro,cliqz/socorro,AdrianGaudebert/socorro-crashstats,adngdb/socorro,pcabido/socorro,m8ttyB/socorro,Tayamarn/socorro,cliqz/socorro,KaiRo-at/socorro,m8ttyB/socorro,m8ttyB/socorro,rhelmer/socorro,cliqz/socorro,AdrianGaudebert/socorro,AdrianGaudebert/socorro-crashstats,KaiRo-at/socorro,spthaolt/socorro,Tchanders/socorro,rhelmer/socorro,Serg09/socorro,mozilla/socorro,AdrianGaudebert/socorro,AdrianGaudebert/socorro-crashstats,m8ttyB/socorro,KaiRo-at/socorro,rhelmer/socorro,spthaolt/socorro,Tayamarn/socorro,linearregression/socorro,linearregression/socorro,KaiRo-at/socorro,AdrianGaudebert/socorro,mozilla/socorro,luser/socorro,Tchanders/socorro,adngdb/socorro,KaiRo-at/socorro,pcabido/socorro,AdrianGaudebert/socorro,spthaolt/socorro,adngdb/socorro,m8ttyB/socorro,lonnen/socorro,twobraids/socorro,Tayamarn/socorro,rhelmer/socorro