chmod -x on lib/async.js
improved seq() documentation wording

Two changes were made here:

- `latter` was changed to `former` (that caused a good deal of headache the other day)
- added some clarification as to what exactly differs from the `compose()` function

Since it's not entirely clear that `compose()` doesn't work left to right, `seq()` should better indicate that it does.
Improve documentation for async.seq

- seq requires the last argument to be a function
- seq short-circuits on errors which means using handleError is redundant
Fix incorrect sample code
Merge pull request #643 from beaugunderson/master

Simple fix for incorrect documentation for async.seq
Merge pull request #648 from asyncanup/patch-1

Fix incorrect sample code
Improve documentation for async.seq

- seq requires the last argument to be a function
- seq short-circuits on errors which means using handleError is redundant
Fix incorrect sample code
Further clarification, link compose
Merge branch 'Qix--patch-1'
Update README.md

remove excess `}`
Merge branch 'fritx-patch-1'
#524 async.queue documentation typo
Merge pull request #569 from jsdevel/removing-execute-permissions-on-async.js

chmod -x on lib/async.js
Remove errant debugger statements, fixes #563
Document drain removal from kill(), fixes #550
Fix incorrect test & favor Date valueOf for old IE

Fixes #666.
Merge remote-tracking branch 'upstream/master' into dead-locks