Beautify the verifier output and add an entry_point

[i3visio]

The output has been beautified and some information about the Json is also displayed in the terminal. With the entry_point set in setup.py users of the library will also be able to launch the verifier using verify-certificate. The output of a sample test would look like the following:

$ verify-certificate -c cert1.json cert2.json 
[*] Certificate #1 | Verifying 'cert1.json'.
[*] Issuer data:
	Name:		University of Learning
	Email:		[email protected]
	Public key:	ecdsa-koblitz-pubkey:msBCHdwaQ7N2ypBYupkp6uNxtr9Pg76imj
[*] Recipient data:
	Name:		Eularia Landroth
	Email:		[email protected]
	Public key:	ecdsa-koblitz-pubkey:mtr98kany9G1XYNU74pRnfBQmaCg2FZLmc
[*] Certificate data:
	Name:		Certificate of Accomplishment
	Description:	Lorem ipsum dolor sit amet, mei docendi concludaturque ad, cu nec partem graece. Est aperiam consetetur cu, expetenda moderatius neglegentur ei nam, suas dolor laudem eam an.
	Criteria:	Nibh iriure ei nam, modo ridens neglegentur mel eu. At his cibo mucius.
	Issued on:	2017-06-29T14:58:57.461422+00:00
[*] Verification steps:
	Step #1. Checking certificate has not been tampered with --> passed
	Step #2. Checking certificate has not expired --> passed
	Step #3. Checking not revoked by issuer --> passed
	Step #4. Checking authenticity --> passed
	Step #5. Validation --> passed

[*] Certificate #2 | Verifying 'cert2.json'.
[*] Issuer data:
	Name:		University of Learning
	Email:		[email protected]
	Public key:	ecdsa-koblitz-pubkey:msBCHdwaQ7N2ypBYupkp6uNxtr9Pg76imj
[*] Recipient data:
	Name:		Eularia Landroth
	Email:		[email protected]
	Public key:	ecdsa-koblitz-pubkey:mtr98kany9G1XYNU74pRnfBQmaCg2FZLmc
[*] Certificate data:
	Name:		Certificate of Accomplishment
	Description:	Lorem ipsum dolor sit amet, mei docendi concludaturque ad, cu nec partem graece. Est aperiam consetetur cu, expetenda moderatius neglegentur ei nam, suas dolor laudem eam an.
	Criteria:	Nibh iriure ei nam, modo ridens neglegentur mel eu. At his cibo mucius.
	Issued on:	2017-06-29T14:58:57.461422+00:00
[*] Verification steps:
	Step #1. Checking certificate has not been tampered with --> passed
	Step #2. Checking certificate has not expired --> passed
	Step #3. Checking not revoked by issuer --> passed
	Step #4. Checking authenticity --> passed
	Step #5. Validation --> passed

[*] Verification summary:
{
  "cert2.json": [
    {
      "name": "Checking certificate has not been tampered with",
      "status": "passed"
    },
    {
      "name": "Checking certificate has not expired",
      "status": "passed"
    },
    {
      "name": "Checking not revoked by issuer",
      "status": "passed"
    },
    {
      "name": "Checking authenticity",
      "status": "passed"
    },
    {
      "name": "Validation",
      "status": "passed"
    }
  ],
  "cert1.json": [
    {
      "name": "Checking certificate has not been tampered with",
      "status": "passed"
    },
    {
      "name": "Checking certificate has not expired",
      "status": "passed"
    },
    {
      "name": "Checking not revoked by issuer",
      "status": "passed"
    },
    {
      "name": "Checking authenticity",
      "status": "passed"
    },
    {
      "name": "Validation",
      "status": "passed"
    }
  ]
}

[kimdhamilton]

Thank you so much for this wonderful change, @i3visio! I noticed travis is failing. I'll check to see the problem.