chore(build): re-create typings after install

[BrainCrumbz]

Also:

1. add clean npm script commands
2. stop tracking typings directory
3. avoid listing every single source file in tsconfig

Related to one of the topics in #60.

[coveralls]

Coverage remained the same at 100.0% when pulling cddcfe1 on BrainCrumbz:chore/cleanup-typings into 56d040b on Stabzs:master.

[Stabzs]

Thank you for making these changes. I was already in the process of making a number of these changes. The addition of rimraf is probably a well-deserved and overdue step.

[BrainCrumbz]

I think you're doing a great job, also keeping up to date with all angular 2 RC updates until final, so yes, go on!

[Stabzs]

@BrainCrumbz sorry for the revert, I was erring on the side of caution.

In the end, while it is nice to not have manual inclusion of files in tsconfig, it was breaking some of the dependencies for tests. I'll take another look at that later and update it accordingly since it is the better way to go.

In addition, a large number of the changes in this changeset were added in one form or another so thank you both again for the contribution!! It is appreciated! And glad you've found the library useful so far!