Update URLs to refer to GitHub instead of Sourceforge

[PaulWalkerUK]

There are URLs in various parts of the project - mostly in the docs I expect. These all need updating to point to GitHub instead of Sourceforge

[rlove]

The following commits were made to work on this. I believe we may have this complete. Waiting on Issue #19 to verify the results of this.

• d385c6d
• 55ee588
• 129bfc3
• 43fe3a2

[rlove]

URL changes are now published.