0.4.0 release
- fix #15, loop unroll option, improving performance, kudos to nt314p
- fixed bug in test program (see #15)
- added flag to select LOOP UNROLL (is optional as it gives larger code size)
- optimized the not unrolled loop with ideas of the unrolling version.
- corrected type lastValue to uint8_t
- add FastShiftOut_scope_test.ino
- update readme.md
- minor edits