Added more functions in language
Merge branch 'master' of https://github.com/webconvforge/sri-delhi-rust-libcss

Conflicts:
	css_language.rs
Merge branch 'master' of https://github.com/webconvforge/sri-delhi-rust-libcss
Some fixes for language structure elements
Merge branch 'master' of https://github.com/webconvforge/sri-delhi-rust-libcss
Update due to API changes in other modules