Add-Functionality

Split-Tweet:
a. now splits tweets at word boundaries;
b. postfix param removed. postfix will be added automatically.

Get-ShortURL: Newly created, get a short tiny url.
Split-Tweet returns message object with properties

7/10/2014 - stefanstranger

Split-Tweet returns message object with following properties:
- Message
- Length

Remark: custom object creation needs PowerShell v3 of above.
Merge remote-tracking branch 'upstream/master'
Based on issue discussion, removing Length as a parameter. Moved it inside and assigned a default value of 130
Merge pull request #8 from sqlchow/Fix_Split-Tweet-length-param

Fix split tweet length param