Refactored and debugged some functions in clj-span.models.line-of-sight and added units tests in clj-span.line-of-sight-test.
Refactored clj-span.models.line-of-sight/filter-sight-line for readability and memoized to-meters.
Added additional test coverage to clj-span.line-of-sight-test.
Merge branch 'master' of https://github.com/lambdatronic/clj-span