Switching to Babel 6 compiler and adding testing infrastructure

[KamranAsif]

Description

• Switched to babel 6
• Removed .react file extensions
• Switched requires to import statments
• Removed erroneous trailing commas
• Added testing framework with Mocha and Chai

Motivation and Context

Lack of testing

How Has This Been Tested?

It does itself :D

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.

[KamranAsif]

@wcjordan I think this used flow..Not sure if theres a better solution

[wcjordan]

Ya these look like flow annotations. The code in constructor works fine with xs: Array though... I wonder if the transforms only handle a subset of cases...

Should we leave the variables but document with jsdoc instead?

[KamranAsif]

Done

[wcjordan]

lgtm. It's probably worth adding documentation or an example PR for adding a test.

[KamranAsif]

@burakcan I re-added all the commas and included babel-plugin-syntax-trailing-function-commas
I had to do a rebase and push forward because of the file renames

[KamranAsif]

@wcjordan Lets do document/example PR as a follow up

[burakcan]

Just upgraded and working like a charm 💯