Added a check before compiling sismo if twig.so is loaded
merged branch fabpot/feat-twig-ext (PR #96)

This PR was merged into the master branch.

Commits
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f34b962 Added a check before compiling sismo if twig.so is loaded

Discussion
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Added a check before compiling sismo if twig.so is loaded

ping @fabpot

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by lyrixx at 2013-02-25T00:03:47Z

I look very quicky but it seems it is not possible to "remove" a function at runtime.
tweaked previous merge