ShieldLeft v3.1.7.1b

3.1.7.1b changes (firegrove)
*Fixed the initial cast problem
Known Issues:
* If a mage casts mana shield and ice barrier, the shield left bar will disappear as soon
  as the first buff fades (even though the other spell still has time/ability)
* The ice barrier code only works with the english version (don't have translations for 
  other languages) - can be easily corrected

3.1.7.1a Changes (firegrove)
* Account for a nil error when taking damage
* Added hidden="true" statements to xml document to hide border of shieldleft bar
Known Issues:
* First cast after entering world is always 0 on the bar
* If a mage casts mana shield and ice barrier, the shield left bar will disappear as soon
  as the first buff fades (even though the other spell still has time/ability)

3.1.7 .1 Changes
* Account for nil error when taking environmental damage
* Will not show window for classes with out shields

3.1.7 Changes
* Updated for WoW 2.4

3.1.6 Changes
* Once again fixed the nil bug
* Priest's +healing is now applied to the shield left value.

3.1.5 Changes
* Casting a shield ontop of another shield now refreshes the numbers properly

3.1.4 Changes
* Once again trying to fix that same nil bug

3.1.3 Changes
* Another attempt at fixing the nil error on line 88

3.1.2 Changes
* Added /sl cast, so the recast of a shield can be macro'd
* Fixed nil error on line 88

3.1.1 Changes
* Updated to UI Version 20200
* Elemental damage should be tracked properly now

3.1.0 Changes
* Changed the window to be a progress bar, so you have a visual aid as well as numeric, showing
  how much shield you have left
* Removed some unnecessary scans

3.0.2 Changes
* If you die when the shield is up, the window should go away
* /sl reset should work properly now


Enchancements:
3.2
* Add support for Ice Barrier (Mage)
* Add support for Frost Ward, Fire Ward, Mana Shield
* Option to estimate time left, not just damage

3.3
* Link in with MobHealth/MobInfo for more mob damage data
* Show shield left for other party members

3.4
* Link in with FuBar, Tital, Pitbull plugins
