Add getTatkalikaMitra method for Bhava
Add getGrahaByAmsha method
Add isVargottama method for Graha
Add isAstangata method for Graha
Tests for Math class
Add isGocharastha method for Graha
Get chara karakas depending on the system
Add getRashiAvastha for Graha class
Add grahaList method
Add GrahaBala class