[distance] fix compilation errors with darwin gcc 4.2.1 and msvc-12.0
[disjoint] fix compilation error on darwin gcc 4.2.1
[disjoint] fix bug in segment-box disjointness check (algorithm
is not always working properly when segment degenerates to a point,
or when segment was parallel to the y-axis)
[test][disjoint] add more segment-box test cases in disjoint_coverage unit test
[distance][segment-box] alternative implementation that does not use forward declarations
Merge pull request #44 from mkaravel/feature/distance

Feature/distance