layout invalidation fix

constrain the document changes to, at a minimum, include the commented
out areas

fixes #11
support for parsing xml

since the new file reference support will be xml format, our scss parser
now has an xml parser.
support reference in xml documentation form

this will allow for intellisense in documents without imports

closes #10
bump version to 0.7.6
option to support include paths to compiler

this will primarily be used to support compass
support for generating dependent files on save

will save any documents referenced by include documents
fix imports

Import parsing was broken when NewLine was introduced
monitor new documents for roots

we need to track new documents as well as those that exist at startup
stackoverflow

derp
bump version
safer import handling

prevent lots of errors when using include compiler paths