rename hearth to src, marketplace to main (bug 1038957)
Merge pull request #520 from ngokevin/hearth

rename hearth to src, marketplace to main (bug 1038957)
Commit from Mozilla Verbatim by user steekid.: 240 of 240 strings translated (0 fuzzy).
Merge branch 'master' of github.com:mozilla/fireplace
Commit from Mozilla Verbatim by user unghost@mozilla-russia.org.: 240 of 240 strings translated (0 fuzzy).