[Typescript]: Changes for typescript definition + add new typescript definition and embed it to orientjs package .

[saeedtabrizi]

based on #184 (comment) i just a fix for it.
Thanks @diegonc
@wolf4ood, @lvca

[coveralls]

Coverage decreased (-0.1%) to 80.574% when pulling 283b6e0 on saeedtabrizi:develop into cdd4572 on orientechnologies:develop.

[coveralls]

Coverage decreased (-0.01%) to 80.68% when pulling b6e3405 on saeedtabrizi:develop into cdd4572 on orientechnologies:develop.

[diegonc]

Hi @saeedtabrizi. Where should I direct further feature requests for typings?

I'm referring particularly to the possibility of using a function in the let call documented at this test.

type OFnStatement = (s: OStatement) => OStatement;

interface OStatement extends OQuery<any> {
  ...
  let(name: string, value: string | OStatement | OFnStatement): OStatement;
}

class ODB extends events.EventEmitter {
  ...
  let(name: string, value: string | OStatement | OFnStatement): OStatement;
}

[saeedtabrizi]

@diegonc unfortunately the https://github.com/saeedtabrizi/DefinitelyTyped/orientjs deployment process is very slow , so I decided to continue here (in master project) .
Welcome to all orientjs typings task in here .
About the requested feature please write an issue with starting by [Typescript] in title .
I will check and implement it asap .
Many thanks .

[saeedtabrizi]

@diegonc , good news that we have the new feature that you requested only last hour .
please write each feature or epic in a seprated issue by starting [Typescript] title .
Thanks