Added Microsoft's Test262 contributions stemming from IE9 RC1:

- 12.14-7.js:  cleaned up
- 15.2.3.3:  89 test case additions
- 15.2.3.4:  29 test case additions
- 15.2.3.6:  1,076 test case additions and 15 minor test case fixes
- 15.2.3.9-1.js:  cleaned up
- 15.3.4.5-2-8.js:  cleaned up
- 15.4.4.14:  14 test case additions and 3 minor test case fixes
- 15.4.4.15:  9 test case additions and 3 minor test case fixes
- 15.4.4.17:  1 test case additions and 1 minor test case fix
- 15.4.4.18:  1 minor test case fix
- 15.4.4.19:  1 test case addition and 2 minor test case fixes
- 15.4.4.20:  3 minor test case fixes
- 15.4.4.21:  1 test case addition and 1 minor test case fix
- 15.4.4.22: 2 minor test case fixes
- 15.9.4.4: 2 minor test case fixes
- 15.9.5.43-0-2.js: minor test case fix