fix typo
Update history-of-events.md
Typo: Change "brackets" to "parentheses"
Fixed parameter order for insertBefore() example.
Append Outside Loop: Grammar and spelling corrections.
Fix some typos.

Closes gh-442
0.3.3
Build: Upgrade to grunt-jquery-content 0.11.1
0.3.4
Advanced Plugin Concepts: Changed "Firebug console" to "console"

Closes gh-453
0.3.5
Widget Factory: Fix rendering negative progressbar value

Closes gh-454
0.3.6
Basic Plugin Creation: Added missing word 'to'

Closes gh-455
0.3.7
Widget Factory: Fix typo (setter -> getter)

Closes gh-456
0.3.8
ThemeRoller: Fixed image references

Fixes gh-466
0.3.9