updating docs for new interface
fixed logic error causing too many environments to be popped #278
don't lose parse settings when parsing imported files #281
finish updating docs for new api
update docs
update readme
fix readme to syntax highlight on github
@import can contain arbitrary expressions #129

wip
split import into top and bottom.
don't put comments after } inside of the closed block
speed up literal() for single letters when whitespace is enabled
set correct parent when copying mixins from import
Remove unused variable: $done
CompileBlock(): replace "return" with "break"
unsetVariable(): replace "name" with "$name"
isEmpty(): Remove the last line

Because the preceding line is "return false;", this line will be never executed.
version bump
setImportDir and addImportDir
set the compared input file in bootstrap test
always coerce colors for user functions #287