Improve the reader and writer helpers

[SandroHc]

Added support for Input/OutputStreams and created helpful builders. Also wrapped the file methods on buffered streams to improve reading/writing performance.

Here is an example:

// with the current implementation
NBTUtil.writeLE(tag, "out.schematic", true);

// with the new builder
NBTUtil.Writer.write().tag(tag).littleEndian().compressed(true).to("out.schematic");

[coveralls]

Coverage increased (+5.5%) to 83.389% when pulling 5bf03fc on SandroHc:master into ae1f2ba on Querz:master.