Add Support for Parameter Blocks

Adds support for KSS Parameter Blocks. Adds related classes, tests, and
examples.
Merge pull request #18 from scaninc/parameters

Add Support for Parameter Blocks
Updates Compatibility Block to Match KSS Spec

Updates the compatibility detection block to correctly follow the spec
so comments such as "Compatible in IE6+, Firefox 2+, Safari 4+" and
"Compatibility untested.".

Updates related tests.
Merge pull request #19 from scaninc/compatibilitySection

Updates Compatibility Block to Match KSS Spec
Adds Travis CI Config File

Adds a Travis CI config file to test on PHP 5.3, 5.4, 5.5, and HHVM.
Merge pull request #20 from scaninc/travis-ci

Adds Travis CI Config File
Adds Support for Stylus

Updates the parser to also look for styl or stylus files. Adds related
tests to check that parser is picking up these files correctly.
Merge pull request #21 from scaninc/stylusSupport

Adds Support for Stylus
Adds hasMarkup Method to Section

Adds a hasMarkup Method to Section that quickly tests that markup is
not null. Adds related tests.

Updates the example to not display styleguide__elements and
styleguide_html is hasMarkup returns false.
Merge pull request #22 from scaninc/hasMarkup

Adds hasMarkup Method to Section