Merge pull request #12 from bayendor/54145659_about_constants_master

Fix about_constants koan

[Delivers #54145659]
Merge pull request #15 from bayendor/54145671_about_triangle_project_master

Fix about_triangle_project koan

[Delivers #54145671]
Fix about_control_statements

* if, then, else, & unless all behave as 
  expected.  nil is neither true or false.

* unless false == !false, etc.

[#54145663]
Fix about_control_statements koan

* while, times, next and for behave as
  expected

* be careful when looping for = and <= in
  order be sure count is correct with while

* break will jump out of a control structure
  when a condition is met

[#54145663]