It would be nice for MemoryUsage to provide numeric values (enhancement)

[philj404]

The MemoryUsage macros provide good insight into what is happening with RAM storage.

But it would be nice to have the library return numeric values, too. This could be used in different ways:

• A sketch can print values in decimal or hex (or both)
• A sketch can customize the output text
• A sketch can send output to somewhere other than Serial
• A sketch can do more than just print the information collected. For example a sketch could safely restart itself if it detected a memory leak (before it crashes).

I have created a pull request #7 which could help with this suggestion. Please let me know if you have questions or concerns.