Spec for ignoring semi-colons at the end of blocks

Refs sass/libsass#595
Spec for preserving whitespaces surrounding selectors

Refs sass/libsass#552
Merge pull request #114 from mzgol/libsass-552

Spec for preserving whitespaces surrounding selectors
Merge pull request #112 from mzgol/libsass-595

Spec for ignoring semi-colons at the end of blocks
Spec for not trimming whitespaces inside

Refs sass/libsass#593