Added :contains and fixed some other stuff
Merge branch 'GistLabs-master'
Updated README
Merge commit '5f66d39ef4d3578' into nested_select
Merge commit 'c19f67760b6fa3cab' into nested_select

Conflicts:
	src/main/java/se/fishtank/css/selectors/scanner/Scanner.java
	src/main/scanner/Scanner.java.rl