test for phpsass added

check if variable is list phpsass has to know this and don't parse it as string
bugfix for SassList::_parse_list function

if $list is a scss variable(list), it has to be parsed that php knows it is an array(list)
added function oppositePosition for compass Extension
added extension susy
each test repaired
Revert "each test repaired"

This reverts commit 75cd1586a6b5945100049ddb825f981ea9c85a28.
repaired optimized sass list, at beginning from _parse_list list has to be converted to string not SassString
php 5.2 do not support namespaces, removed them for Compass Extension
Merge pull request #89 from vivid-planet/master

Optimized PHPSass and added new Extension Susy
Merge pull request #90 from vivid-planet/php5.2support

php 5.2 do not support namespaces, removed them for Compass Extension
Fixed issue where media nodes inside anything but root or rule nodes (e.g. mixins,
loops) would either recurse infinitely or generate a fatal error.

Fixed an issue in the same code where media nodes in loops were only parsing
their tokens once so variables inside the @media rule would only get evaluated on
the first pass through the loop.

Fixed issue where scss syntax passed through mixin @content wasn't being parsed.

Added test cases for media in mixin and media in for loop.
Merge pull request #94 from arkonan/media

@media inside mixins, loops, etc should not fatal error or recurse infinitely