Sqlchow buildon stefanstrangers rawcode

Hi @adbertram ,

This code is based of the raw code for the commit 2fa90c4513bea9a8b107acbf22cb220e6c572eb2 from @stefanstranger.

I have added two things:

- Added functionality to Split-Tweet function, which basically lets you split the tweets at word boundaries.
- Added a Get-ShortURL function that lets you shorten URLs. This function is based on a [PowerTip](http://powershell.com/cs/blogs/tips/archive/2014/09/25/creating-tinyurls.aspx). If you type *Get-Help Get-ShortURL -online*, it will take you to the webpage for the tip.

Please check the code and let me know if the code can be merged or let me know if you need more details.

Regards,
SqlChow.