Mainting support#1

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TiTi wants to merge 7 commits intocowboy:masterfrom

TiTi:master

Commits on Dec 8, 2010

update support for current consoles (firefox/IE8/chrome/opera)
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Commits on Dec 11, 2010

Commits on Dec 26, 2010

Remove opera.postError since console.* support in Opera Dragonfly
TiTi
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Restore degradation path for IE8 ("debug" level logs were'nt visible)
TiTi
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Moved trace function to have only 1 trace function in memory.
TiTi
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Commits on Jan 9, 2011

-Enhance pass-through methods (checks, group* methods degradation with .log, ...)
TiTi
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