CMake support
Install in separate subdirectory
Add support for aria attributes

Reference: http://dev.w3.org/html5/markup/aria/aria.html#aria-attrs-all
Added MAIN-tag
Merge branch 'master' of https://github.com/thekvs/tidy-html5
Merge branch 'master' of https://github.com/andrewle/tidy-html5
Merge branch 'master' of https://github.com/HoffmannP/tidy-html5

Conflicts:
	src/attrdict.c