Fixed about_class_methods.rb to pass tests

Learned that:
* objects are objects and classes are classes,
* classes are objects too,
* objects and classes have methods.

[#65851794]
Fixed about_class_methods.rb to pass tests

Learned that:
* you can define methods on individual objects,
* and other objects are not affected by these singleton methods,
* classes and instances do not share instance variables,
* you can define class methods inside the class.

[#65851794]
Fixed about_class_methods.rb to pass tests

Learned that:
* class statements return the value of their last expression,
* self while inside class is class object not instance,
* you can use self instead of an explicit reference,
* there's more than one way to write class methods.

[#65851794]
Fixed about_message_passing.rb to pass tests

Learned that:
* methods can be called directly,
* methods can be invoked by sending the message,
* methods can be invoked dynamically,
* classes can be asked if they know how to respond.

[#65851796]
Modified edgecase.rb to fix ruby version
Fixed about_message_passing.rb to pass tests

Learned about:
* sending a message with arguments,
* and that sending undefined messages to a typical object results in errors,
* and that you can catch errors with method missing method.

[#65851796]
Fixed about_message_passing.rb to pass tests

Learned about:
* Overwriting method missing conditionally,
* and that calling super when conditions aren't met, i.e. raising NoMethodError.
* Explicitly implementing respond to method.

[#65851796]
Corrected path to triangle.rb

[#65851768]
Wrote triangle method to pass all tests

[#65851768]
Refactored triangle method
Fixed about_dice_project.rb to pass tests

Wrote code for DiceSet class.

[#65851786]
Fixed about_proxy_object_project.rb to pass tests

Added methods to Proxy class.

[#65851798]
Merge pull request #26 from mkreyman/65851794_about_class_methods_master

about class methods master

[Delivers #65851794]
Merge pull request #27 from mkreyman/65851796_about_message_passing_master

about message passing master

[Delivers #65851796]
Merge pull request #28 from mkreyman/65851768_about_triangle_project_master

about triangle project master

[Delivers #65851768]
Merge pull request #30 from mkreyman/65851786_about_dice_project_master

Fixed about_dice_project.rb to pass tests

[Delivers #65851786]
Merge pull request #31 from mkreyman/65851798_about_proxy_object_project_master

Fixed about_proxy_object_project.rb to pass tests

[Delivers #65851798]