Fixed usage of hasCssReset

Moved it to CompilerOptions
Made ctor for CssPolyfillKind private
renamed file for CompilerOptions: options -> compiler_options.dart
Merge pull request #569 from kevmoo/fix_cssPolyfillKind

Fix css polyfill kind
Merge pull request #568 from kevmoo/polymer

using 'path' package, updated html5lib dependency
release 0.5.2