Upgraded fast-sourcemap-concat to 0.2.4 to fix issue reported in ember-cli
Upgraded fast-sourcemap-concat to 0.2.4 to fix issue reported in ember-cli

Hoping it will help us push out fix to https://github.com/ember-cli/ember-cli/issues/3098#issuecomment-74359080 sooner.
joliss/broccoli-sourcemap-concat,rlivsey/broccoli-concat,ember-cli/broccoli-concat,ef4/broccoli-sourcemap-concat,joefiorini/broccoli-sourcemap-concat,ef4/broccoli-sourcemap-concat,joliss/broccoli-sourcemap-concat,joefiorini/broccoli-sourcemap-concat,rlivsey/broccoli-concat,broccolijs/broccoli-concat,ember-cli/broccoli-concat,broccolijs/broccoli-concat