Batch log requests

[jaketodaro]

It would be nice to batch log messages that happen in quick succession. This would cut down on the number of network requests for errors that happen in tight loops, or anything else where multiple log messages are sent in quick succession. I'm not sure how to do this without potentially cutting off the last log messages if the user closes the page quickly after causing the log messages to be sent.

logger.batchLogDelay(1000) could make the logger wait 1000ms after receiving a log to send the original log and any logs that have been sent since the original one.

[ajbrown]

@jaketodaro This is something on my scratchpad for 1.0. I'll make this the official story for it :-) Thanks!