An indexed multiple readable spsc ring buffer.
```rust extern crate indexedringbuffer; use indexedringbuffer::*;
let (mut p, mut c, r) = indexedringbuffer::
for i in 0..101 { p.push(i); c.shift(); }
for i in 101..106 { p.push(i); }
let (start, end, data) = r.getfrom(101,5).unwrap(); asserteq!(data,vec![101,102,103,104,105]); asserteq!(start,101); asserteq!(end,105);
c.shiftto(105); let rslt = r.getall(); assert_eq!(rslt,None);
```
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