Bugfixes
(#3962) - Limit concurrent attachment requests 6a2955c
(#4632) - fix attachment md5sum memory leak 52201f1
(#4967) - fix map function called twice 45156c5
(#5402) - Remove the unbounded accumulation of listeners 04c377b
(#5417) - proper websql validation for cordova+ios f05ec7c
(#5214) - Stop squelching errors d31bf17