Trim whitespace characters inside Blade compiler echos. Fixes https://github.com/illuminate/view/issues/16 .

Not only does this make the cached views code look a little better, it also means that new line characters inside {{ and }} are also trimmed, so this also fixes https://github.com/illuminate/view/issues/13 as well.
Add trailing space back into multiline CommentsAreCompiled test.
Merge pull request #20 from GaryJones/blade-echos

Blade echo whitespace fixes