Destructured function parameters
Fix block function example for nonstrict mode (fixes #63)
Update description of destructured parameters
Add warning about destructuring assignment throwing errors
Fix typeof typo
Merge pull request #64 from mohsen1/patch-1

Fix typeof typo
Added aside mentioning Object.assign() and accessor properties (fixes #66)
Fix typo in example (fixes #67)
Updated order of chapters to reflect new symbols chapter
Updated description of destructured parameters to reflect es-discuss feedback