* Support all datatypes for StreamWriter
* Support setting styles with StreamWriter
**NOTE:** This is a breaking change. Values are now explicitly
passed as a []interface{} for simplicity. We also let styles to be
set at the same time.
* Create function to write stream into a table
* Write rows directly to buffer
Avoiding the xml.Encoder makes the streamer faster and use less
memory.
Using the included benchmark, the results went from:
> BenchmarkStreamWriter-4 514 2576155 ns/op 454918 B/op 6592 allocs/op
down to:
> BenchmarkStreamWriter-4 1614 777480 ns/op 147608 B/op 5570 allocs/op
* Use AddTable instead of SetTable
This requires reading the cells after they have been written,
which requires additional structure for the temp file.
As a bonus, we now efficiently allocate only one buffer when
reading the file back into memory, using the same approach
as ioutil.ReadFile.
* Use an exported Cell type to handle inline styles for StreamWriter
Cameron Howey