Improve assertion syntax

[tusharsadhwani]

For now, you need to provide the 2-tuple next to every assert statement. This is problematic for two reasons:

• It's inconvenient
• If code inside your Solution method has a failing assertion, code crashes.

Supporting this will be done in a few phases:

• [ ] #14
• [ ] #15
• [ ] Figuring out support for other assertion syntaxes as per convenience