Shortened some really long example strings, more validation docs

[jameshurst]

• Shortened some more example strings that were pretty long
• Added some information on what validation does
• Moved validation lower on the lib.rs page and moved Reading to the top since Reading is probably the most used case

[jameshurst]

Ah, rustfmt needs to be run. I'll fix that up once I'm back at my computer.

[frewsxcv]

Travis is backed up right now, just going to merge