fixed method; added method to overwrite get-var - used for realurl2

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branch : 0.8
fix rare media cache bug

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branch : 0.8
fix warnings

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branch : 0.8
adjust configureation cache recvalidation

--HG--
branch : 0.8
remove config filesystem caching, it causes too much problems

--HG--
branch : 0.8
fixed fatal error (calling empty on method call)

--HG--
branch : 0.8
extended form API a bit

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branch : 0.8
merge with 0.8

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branch : 0.9
rename : lib/sly/Service/Medium.php => lib/sly/Service/DeletedMedium.php
fixed version (don't forget that we cannot remove the version here, see a02f6ccb183b)

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branch : 0.9