Regression bug: Variables in @import statements

[mryand]

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In 0.3.9 lessphp supported the use of variables in import statements, per this spec: http://lesscss.org/features/#variables-feature-import-statements

This same feature appears to be broken in 0.5.

Example: @variable: "otherfile"; @import "@{variable}.less";

This includes otherfile.less in 0.3.9, but fails to include it in 0.5.

[mathias-heilmann]

In the version 0.4.0 of lessphp it's also still working but broken in 0.5.0.