Make bower concurrent friendly, fixes #933
Revert "Merge pull request #1077 from neoziro/fix-concurrent-renaming"

This reverts commit cd541c7a204a545a38996f98ac0bc5cc615f3ffa, reversing
changes made to 3074711828cdbfe7a8660e5cdc72018bd50d2a05.
Merge remote-tracking branch 'sheerun/fix/concurrency'
Merge pull request #1216 from benschwarz/master

Revert 1077, merge 1211