Create unit test for verify issue.
Correct the bad condition.
Correct the version test false since last release.
Merge pull request #11 from ygrenier/issues/10-null-exception-on-calc_planet_star

Issues/10 null exception on calc planet star
Release 2.0.0.4
Base of house engine
Implement geographic position structs
Add some classes for house calculation
Obliquity of the ecliptic at Julian date
Prepare nutation calculation.