Add 'include www' checkbox on project domain page

[dshoreman]

Adds a checkbox that'll enable an entry for www.<the-domain>.com when generating the nginx config's server_name line.

[codecov[bot]]

Codecov Report

Merging #555 (9d15b03) into develop (866ac50) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             develop     #555   +/-   ##
==========================================
  Coverage      99.57%   99.57%           
  Complexity       421      421           
==========================================
  Files             89       89           
  Lines           1168     1172    +4     
==========================================
+ Hits            1163     1167    +4     
  Misses             5        5           

Impacted Files	Coverage Δ
app/Projects/Application.php	100.00% <ø> (ø)
app/Projects/Redirect.php	100.00% <ø> (ø)
app/Http/Requests/Projects/NewProjectApp.php	100.00% <100.00%> (ø)
app/Http/Requests/Projects/NewProjectRedirect.php	100.00% <100.00%> (ø)

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