Added API to check if a Steem UserName is taken

From now, you can query the API /api/steemit/account/validate-user/ to retrieve the status of a steem account name.

For example:

curl -s -X POST "https://steemyy.com/api/steemit/account/validate-user/" -d "id=justyy"

This will return:

{"accountName":"justyy","result":"taken"}

If a username is invalid, e.g.

curl -s -X POST "https://steemyy.com/api/steemit/account/validate-user/" -d "id=123"

This will return:

{"accountName":"123","result":"Account name should start with a letter."}

Otherwise:

curl -s -X POST "https://steemyy.com/api/steemit/account/validate-user/" -d "id=justyy12345"

if a user account is not existent (meaning that it is available)

{"accountName":"justyy12345","result":"good"}

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I hope this helps!

Steem On!~

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