extant_errors->shim
Clean up setTimeout spy
Check for shim existence before scheduling timeout
addReporter and getReporters
Update embed snippet
Merge branch 'custom_reporters'

Conflicts:
	src/client.js
Use setTimeout to defer custom reporter invocation
Merge remote-tracking branch 'canonical/master' into custom_reporters

Conflicts:
	src/client.js
Pass options to custom reporters
Remove auto-slurp of custom reporters
Airbrake onload
Document Airbrake.addReporter
Merge remote-tracking branch 'canonical/master' into custom_reporters

Conflicts:
	src/client.js
	test/unit/client_test.coffee
Remove duplicated test
Update README for async download and `wrap`
Merge pull request #51 from duncanbeevers/dont_block_onload

Update README for async download and `wrap`
Pass script to getter
Rename attribute_name as attar
Merge pull request #50 from duncanbeevers/custom_reporters

Custom reporters
Update Airbrake.try Readme example