More modular grammer

I built this grammer last year for textmate. I converted it to atom format and added in some bits from the existing grammer. It contains a bunch more of the modern Cisco configurations but does not contain a lot of the old configurations found in your grammer such as Appletalk, x.25, apollo but these are rarely encountered these days. Please consider my pull request. I will continue to add more grammer elements it is far from complete but does currently get about 80-90% of most configurations.